/* call handling
 *
 * (C) 2020 by Andreas Eversberg <jolly@eversberg.eu>
 * All Rights Reserved
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

/* Call forking process
 *
 * A call can be forwarded to one or multiple endpoints (call forking).
 *
 * In case of call forking, each terminating endpoint that disconnects or
 * releases, is removed from the list of terminating endpoints. The cause is
 * collected according to mulitpoint process at Q.931. If all endpoints have
 * disconnected or released, the originating endpoint is released with the
 * collected cause.
 *
 * If one terminating endpoint answers the call, all other endpoints are
 * released with the cause "non-selected user clearing".
 *
 * If the originating endpoint disconnectes or releases prior answer, all
 * terminating endpoints are released with the same cause.
 */

/* SDP negotiation process
 *
 * The originating endpoint sends a CC-SETUP-REQ with SDP included.
 *
 * If no RTP proxy is enabled, the SDP is forwarded towards terminating
 * endpoint or multiple terminating endpoints (in case of call forking). The
 * first reply with SDP from the terminating endpoint is stored. In case of
 * single terminating endpoint, it is forwarded towards the originating
 * endpoint with progress indicator set to 1 or 8. In case of multiple
 * terminating endpoints (call forking) the SDP is forwarded as soon a
 * CC-SETUP-RSP is received from the first terminating endpoint that answers.
 * The SDP negotiation is complete.
 *
 * If RTP proxy is enabled, the SDP is negotiated with the supported codecs of
 * this router. The first reply to the CC-SETUP-REQ message will include the
 * SDP reply as well as progress indicator set to 8 (if not a CC-SETUP-CNF
 * message) towards originating endpoint. The SDP negotiation on the
 * originating side is complete. If the call gets forwarded to a single or
 * multiple terminating endpoints, an SDP is generated with the supported
 * codecs of this router. In case of single terminating endpoint, the SDP of the
 * first reply to the CC-SETUP-IND message is used to negotiate the codec. In
 * case of multiple terminating endpoints (call forking) the SDP reply is
 * stored and processed when a CC-SETUP-RSP is received from the first
 * terminating endpoint that answers. The SDP negotiation on the terminating
 * side is complete.
 */

#include <stdio.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>
#include <stdint.h>
#include <stdlib.h>
#include <math.h>
#include <sys/types.h>
#include <sys/wait.h>
#include "../libdebug/debug.h"
#include "../libg711/g711.h"
#include "call.h"
#include "audio.h"
#include "display.h"

call_t *call_list = NULL;
struct timer status_timer;
static osmo_cc_endpoint_t *cc_ep;
static const char *routing_script, *routing_shell;

static struct osmo_cc_helper_audio_codecs codecs_def[] = {
	{ "PCMA", 8000, 1, g711_encode_alaw, g711_decode_alaw },
	{ "PCMU", 8000, 1, g711_encode_ulaw, g711_decode_ulaw },
	{ "telephone-event", 8000, 1, encode_te, decode_te },
	{ "L16", 8000, 1, encode_l16, decode_l16 },
	{ NULL, 0, 0, NULL, NULL},
};

static void refresh_status(void)
{
	osmo_cc_call_t *cc_call;
	int from_count, to_count;
	call_t *call;
	call_relation_t *relation;

	display_status_start();

	for (cc_call = cc_ep->call_list; cc_call; cc_call = cc_call->next) {
		if (cc_call->state != OSMO_CC_STATE_ATTACH_IN)
			continue;
		if (!cc_call->attached_name)
			continue;
		from_count = 0;
		for (call = call_list; call; call = call->next) {
			if (!call->relation_list)
				continue;
			if (!!strcmp(cc_call->attached_name, call->relation_list->interface))
				continue;
			to_count = 0;
			for (relation = call->relation_list->next; relation; relation = relation->next) {
				display_status_line(cc_call->attached_name, from_count, call->relation_list->id, to_count, relation->interface, relation->id, relation->state);
				to_count++;
			}
			if (!to_count)
				display_status_line(cc_call->attached_name, from_count, call->relation_list->id, 0, NULL, NULL, 0);
			from_count++;
		}
		if (!from_count)
			display_status_line(cc_call->attached_name, 0, NULL, 0, NULL, NULL, 0);
	}

	display_status_end();
}

static int status_needs_update = 0;

static void status_timeout(struct timer *timer)
{
	static int last_interfaces = -1;
	osmo_cc_call_t *cc_call;
	int interfaces = 0;

	for (cc_call = cc_ep->call_list; cc_call; cc_call = cc_call->next) {
		if (cc_call->state != OSMO_CC_STATE_ATTACH_IN)
			continue;
		interfaces++;
	}

	if (interfaces != last_interfaces) {
		last_interfaces = interfaces;
		status_needs_update = 1;
	}

	if (status_needs_update) {
		refresh_status();
		status_needs_update = 0;
	}

	timer_start(timer, 0.1);
}

static const char *state_names[] = {
	"IDLE",
	"SETUP",
	"OVERLAP",
	"PROCEEDING",
	"ALERTING",
	"CONNECT",
	"DISC-FROM-ORIG",
	"DISC-FROM-TERM",
};

static void new_state(call_t *call, enum call_state state)
{
	PDEBUG(DROUTER, DEBUG_DEBUG, "(call #%d) Changing state %s -> %s.\n", call->num, state_names[call->state], state_names[state]);
        call->state = state;
}

static const char *relation_name(call_relation_t *relation)
{
	static char text[128];

	if (relation->num == 0)
		sprintf(text, "(call #%d, originator)", relation->call->num);
	else
		sprintf(text, "(call #%d, terminator #%d)", relation->call->num, relation->num);

	return text;
}

static call_t *call_create(void)
{
	call_t *call, **call_p;
	static int call_num = 0;

	call = calloc(1, sizeof(*call));
	if (!call) {
		PDEBUG(DROUTER, DEBUG_ERROR, "No memory!\n");
		abort();
	}

	call->num = ++call_num;
	call->routing.call = call;

	/* append to list */
	call_p = &call_list;
	while (*call_p)
		call_p = &((*call_p)->next);
	*call_p = call;

	PDEBUG(DROUTER, DEBUG_DEBUG, "(call #%d) Created new call instance.\n", call->num);

	return call;
}

static void relation_destroy(call_relation_t *relation);

static void call_destroy(call_t *call)
{
	call_t **call_p;

	new_state(call, CALL_STATE_IDLE);

	/* remove setup message */
	free(call->setup_msg);

	/* destroy all relations */
	while (call->relation_list)
		relation_destroy(call->relation_list);

	/* destroy routing */
	routing_stop(&call->routing);
	routing_env_free(&call->routing);

	/* detach */
	call_p = &call_list;
	while (*call_p) {
		if (*call_p == call)
			break;
		call_p = &((*call_p)->next);
	}
	*call_p = call->next;

	PDEBUG(DROUTER, DEBUG_DEBUG, "(call #%d) Destroyed call instance.\n", call->num);

	free(call);
}

static call_relation_t *relation_create(call_t *call)
{
	call_relation_t *relation, **relation_p;
	int rc;

	relation = calloc(1, sizeof(*relation));
	if (!relation) {
		PDEBUG(DROUTER, DEBUG_ERROR, "No memory!\n");
		abort();
	}

	relation->call = call;

	/* allocate jitter buffer */
	rc = jitter_create(&relation->orig_dejitter, 8000 / 10); // FIXME: size
	if (rc < 0)
		abort();
	rc = jitter_create(&relation->term_dejitter, 8000 / 10); // FIXME: size
	if (rc < 0)
		abort();

	/* append to list, count number of relation */
	relation_p = &call->relation_list;
	while (*relation_p) {
		relation->num++;
		relation_p = &((*relation_p)->next);
	}
	*relation_p = relation;

	PDEBUG(DROUTER, DEBUG_DEBUG, "%s Created new endpoint relation instance.\n", relation_name(relation));

	return relation;
}

static void relation_destroy(call_relation_t *relation)
{
	call_relation_t **relation_p;

	/* playback and record */
	wave_destroy_playback(&relation->play);
	wave_destroy_record(&relation->rec);

	/* dtmf decoder */	
	dtmf_decode_exit(&relation->dtmf_dec);

	/* SDP */
	free((char *)relation->sdp);

	/* session */
	if (relation->cc_session) {
		osmo_cc_free_session(relation->cc_session);
		relation->cc_session = NULL;
	}

	/* destroy jitter buffer */
	jitter_destroy(&relation->orig_dejitter);
	jitter_destroy(&relation->term_dejitter);

	/* detach */
	relation_p = &relation->call->relation_list;
	while (*relation_p) {
		if (*relation_p == relation)
			break;
		relation_p = &((*relation_p)->next);
	}
	*relation_p = relation->next;

	PDEBUG(DROUTER, DEBUG_DEBUG, "%s Destroyed endpoint relation instance.\n", relation_name(relation));

	free(relation);

	/* refresh status: we lost a call (originating and/or terminating) */
	status_needs_update = 1;
}

int call_init(osmo_cc_endpoint_t *ep, const char *_routing_script, const char *_routing_shell)
{
	cc_ep = ep;
	routing_script = _routing_script;
	routing_shell = _routing_shell;
	timer_init(&status_timer, status_timeout, NULL);
	status_timeout(&status_timer);
	return 0;
}

void call_exit(void)
{
	timer_exit(&status_timer);

	/* destroy all calls */
	while (call_list)
		call_destroy(call_list);
}

/* handle all calls, if it returns 1, work has been done, so it must be called again */
int call_handle(void)
{
	int w;
	call_t *call;
	int status;
	pid_t pid;

	for (call = call_list; call; call = call->next) {
		/* must return, call may be destroyed */
		w = routing_handle(&call->routing);
		if (w)
			return 1;
	}

	/* eat zombies */
	while ((pid = waitpid(-1, &status, WNOHANG)) > 0) {
		PDEBUG(DROUTER, DEBUG_DEBUG, "Script child %d terminated.\n", pid);
		for (call = call_list; call; call = call->next) {
			if (call->routing.script_pid == pid) {
				/* tell routing that script has terminated */
				call->routing.script_pid = 0;
			}
		}
	}

	return 0;
}

/*
 * RTP-Proxy
 */

/* send SDP answer to originator */
static void proxy_send_sdp_answer(call_relation_t *relation, osmo_cc_msg_t *msg)
{
	const char *sdp;

	/* no proxy */
	if (!relation->rtp_proxy)
		return;

	/* NOTE: The SDP was removed at cc_message() */

	/* add progreess if not connect message, but for first message or disconnect message */
	if (msg->type != OSMO_CC_MSG_SETUP_CNF
	 && (msg->type == OSMO_CC_MSG_DISC_IND || !relation->codec_negotiated)) {
		/* process */
		PDEBUG(DROUTER, DEBUG_DEBUG, "Sending progress indicator 8 to allow audio.\n");
		osmo_cc_add_ie_progress(msg, OSMO_CC_CODING_ITU_T, OSMO_CC_LOCATION_BEYOND_INTERWORKING, OSMO_CC_PROGRESS_INBAND_INFO_AVAILABLE);
	}

//	if (!relation->codec_negotiated || msg->type == OSMO_CC_MSG_SETUP_CNF) { gibt einen crash, da codec vor der antwort schon gesetzt ist. warum sollten wir nach einer antwort denn nochmal den codec schicken?
	if (!relation->codec_negotiated) {
		sdp = osmo_cc_helper_audio_accept(relation, relation->orig_codecs, receive_originator, relation->call->setup_msg, &relation->cc_session, &relation->codec, 0);
		if (sdp) {
			relation->codec_negotiated = 1;
			PDEBUG(DROUTER, DEBUG_DEBUG, "Sending SDP answer to originator with supported codecs.\n");
			/* SDP */
			osmo_cc_add_ie_sdp(msg, sdp);
		} else {
			relation->rtp_proxy = 0;
			PDEBUG(DROUTER, DEBUG_ERROR, "Originator's setup message does not contain a codec we support, cannot use RTP-Proxy!\n");
		}
	}
}

/*
 * process call from originator
 */

/* a new call is received */
static void orig_setup(uint32_t callref, osmo_cc_msg_t *old_msg)
{
	call_t *call;
	call_relation_t *relation;
	char sdp[65536];
	uint8_t type, plan, present, screen;
	char number[256];
	int rc;

	/* creating call instance, transparent until setup with hdlc */
	call = call_create();
	if (!call) {
		PDEBUG(DROUTER, DEBUG_ERROR, "Cannot create calll instance.\n");
		abort();
	}
	relation = relation_create(call);
	/* link with cc */
	relation->cc_callref = callref;

	PDEBUG(DROUTER, DEBUG_DEBUG, "%s CC-SETUP-REQ from originator.\n", relation_name(relation));

	/* store setup message in call structure */
	call->setup_msg = osmo_cc_clone_msg(old_msg);

	/* store SDP */
	rc = osmo_cc_get_ie_sdp(old_msg, 0, sdp, sizeof(sdp));
	if (rc >= 0) {
		free((char *)relation->sdp);
		relation->sdp = strdup(sdp);
	}

	/* store called number */
	rc = osmo_cc_get_ie_called(old_msg, 0, &type, &plan, number, sizeof(number));
	if (rc >= 0 && number[0]) {
		/* add number to current dial string */
		if (strlen(number) < sizeof(call->dialing_number))
			strcpy(call->dialing_number, number);
	}

	/* store keypad */
	rc = osmo_cc_get_ie_keypad(old_msg, 0, number, sizeof(number));
	if (rc >= 0 && number[0]) {
		/* add number to current dial string */
		if (strlen(number) < sizeof(call->dialing_keypad))
			strcpy(call->dialing_keypad, number);
	}

	/* store peer info for status */
	rc = osmo_cc_get_ie_calling_interface(old_msg, 0, relation->interface, sizeof(relation->interface));
	rc = osmo_cc_get_ie_calling(old_msg, 0, &type, &plan, &present, &screen, relation->id, sizeof(relation->id));

	/* apply environment for routing */
	routing_env_msg(&call->routing, old_msg);

	/* start routing script */
	routing_start(&call->routing, routing_script, routing_shell);

	/* go into setup state and return */
	new_state(call, CALL_STATE_SETUP);

	/* refresh status: we have originating call */
	status_needs_update = 1;

	return;
}

/* information (dialing) is received from originating side */
static void orig_info(call_t *call, osmo_cc_msg_t *old_msg)
{
	uint8_t type, plan;
	char number[256];
	char keypad[256];
	uint8_t duration_ms, pause_ms, dtmf_mode;
	char dtmf[256];
	char command[512];
	int rc;
	osmo_cc_msg_t *new_msg;

	PDEBUG(DROUTER, DEBUG_DEBUG, "%s CC-INFO-REQ from originator.\n", relation_name(call->relation_list));

	/* add called number to dial string */
	rc = osmo_cc_get_ie_called(old_msg, 0, &type, &plan, number, sizeof(number));
	if (rc < 0)
		number[0] = '\0';
	if (number[0]) {
		/* add number to current dial string */
		if (strlen(number) < sizeof(call->dialing_number) - strlen(call->dialing_number))
			strcat(call->dialing_number, number);
	}

	/* add keypad to dial string */
	rc = osmo_cc_get_ie_keypad(old_msg, 0, keypad, sizeof(keypad));
	if (rc < 0)
		keypad[0] = '\0';
	if (keypad[0]) {
		/* add number to current dial string */
		if (strlen(keypad) < sizeof(call->dialing_keypad) - strlen(call->dialing_keypad))
			strcat(call->dialing_keypad, keypad);
	}

	/* dtmf digits */
	rc = osmo_cc_get_ie_dtmf(old_msg, 0, &duration_ms, &pause_ms, &dtmf_mode, dtmf, sizeof(dtmf));
	if (rc < 0 || (dtmf_mode != OSMO_CC_DTMF_MODE_ON && dtmf_mode != OSMO_CC_DTMF_MODE_DIGITS))
		dtmf[0] = '\0';

	/* if there is only one call relation, forward that message */
	if (call->relation_list->next && !call->relation_list->next->next) {
		/* concat number to id of relation */
		if (strlen(call->relation_list->next->id) + strlen(number) < sizeof(call->relation_list->next->id))
			strcat(call->relation_list->next->id, number);
		new_msg = osmo_cc_clone_msg(old_msg);
		new_msg->type = OSMO_CC_MSG_INFO_IND;
		osmo_cc_ll_msg(cc_ep, call->relation_list->next->cc_callref, new_msg);
		return;
	}

	/* if there is no call in overlap state, perform routing */
	if (call->state == CALL_STATE_OVERLAP && !call->relation_list->next) {
		if (!call->routing.routing) {
			/* restart routing with new dial string */
			routing_env_dialing(&call->routing, call->dialing_number, call->dialing_keypad);
			routing_start(&call->routing, routing_script, routing_shell);
		} else {
			/* send digits to routing */
			if (number[0]) {
				snprintf(command, sizeof(command) - 1, "dialing %s", number);
				command[sizeof(command) - 1] = '\0';
				routing_send(&call->routing, command);
			}
			if (keypad[0]) {
				snprintf(command, sizeof(command) - 1, "keypad %s", keypad);
				command[sizeof(command) - 1] = '\0';
				routing_send(&call->routing, command);
			}
		}
	}

	/* send dtmf, to routing in all other states */
	if (!call->relation_list->next) {
		if (call->routing.routing) {
			if (dtmf[0]) {
				snprintf(command, sizeof(command) - 1, "dtmf %s", dtmf);
				command[sizeof(command) - 1] = '\0';
				routing_send(&call->routing, command);
			}
		}
	}
}

/* disconnect is received from originating side */
static void orig_disc(call_t *call, osmo_cc_msg_t *old_msg)
{
	osmo_cc_msg_t *new_msg;
	call_relation_t *relation;

	PDEBUG(DROUTER, DEBUG_DEBUG, "%s CC-DISC-REQ from originator.\n", relation_name(call->relation_list));

	/* stop routing, if originator hangs up */
	if (call->routing.routing) {
		routing_stop(&call->routing);
	}

	/* if there is no terminating call, release originator and destroy call */
	if (!call->relation_list->next) {
		new_msg = osmo_cc_clone_msg(old_msg);
		new_msg->type = OSMO_CC_MSG_REL_IND;
		osmo_cc_ll_msg(cc_ep, call->relation_list->cc_callref, new_msg);
		/* destroy call */
		call_destroy(call);
		return;
	}

	/* if there is one terminating call, forward the disc message */
	if (!call->relation_list->next->next) {
		/* update call state for status display */
		call->relation_list->next->state = CALL_STATE_DISC_FROM_TERM;
		status_needs_update = 1;
		/* forward disc message */
		new_msg = osmo_cc_clone_msg(old_msg);
		new_msg->type = OSMO_CC_MSG_DISC_IND;
		osmo_cc_ll_msg(cc_ep, call->relation_list->next->cc_callref, new_msg);
		new_state(call, CALL_STATE_DISC_FROM_ORIG);
		return;
	}

	/* if there are multiple terminating calls, release them and originator and destroy call */
	for (relation = call->relation_list->next; relation; relation = relation->next) {
		new_msg = osmo_cc_clone_msg(old_msg);
		new_msg->type = OSMO_CC_MSG_REL_IND;
		osmo_cc_ll_msg(cc_ep, relation->cc_callref, new_msg);
	}
	new_msg = osmo_cc_clone_msg(old_msg);
	new_msg->type = OSMO_CC_MSG_REL_IND;
	osmo_cc_ll_msg(cc_ep, call->relation_list->cc_callref, new_msg);
	/* destroy call */
	call_destroy(call);
}

/* release is received from originating side */
static void orig_rel(call_t *call, osmo_cc_msg_t *old_msg)
{
	osmo_cc_msg_t *new_msg;
	call_relation_t *relation;

	PDEBUG(DROUTER, DEBUG_DEBUG, "%s CC-REL-REQ from originator.\n", relation_name(call->relation_list));

	/* stop routing, if originator hangs up */
	if (call->routing.routing) {
		routing_stop(&call->routing);
	}

	/* release all terminating calls, if any and confirm originator and destroy call */
	for (relation = call->relation_list->next; relation; relation = relation->next) {
		new_msg = osmo_cc_clone_msg(old_msg);
		new_msg->type = OSMO_CC_MSG_REL_IND;
		osmo_cc_ll_msg(cc_ep, relation->cc_callref, new_msg);
	}
	new_msg = osmo_cc_clone_msg(old_msg);
	new_msg->type = OSMO_CC_MSG_REL_CNF;
	osmo_cc_ll_msg(cc_ep, call->relation_list->cc_callref, new_msg);
	/* destroy call */
	call_destroy(call);
}

/* other message is received from originating side */
static void orig_other(call_t *call, osmo_cc_msg_t *old_msg)
{
	osmo_cc_msg_t *new_msg;

	PDEBUG(DROUTER, DEBUG_DEBUG, "%s Other CC message from originator.\n", relation_name(call->relation_list));

	/* if there is one terminating call, forward the message */
	if (call->relation_list->next && !call->forking) {
		new_msg = osmo_cc_clone_msg(old_msg);
		new_msg->type = old_msg->type | 1; /* convert REQ->IND, RSP->CNF */
		osmo_cc_ll_msg(cc_ep, call->relation_list->next->cc_callref, new_msg);
		return;
	}
}

/*
 * process call from terminator
 */

/* overlap dialing is received from terminating side */
static void term_progress(call_t *call, call_relation_t *relation, osmo_cc_msg_t *old_msg)
{
	osmo_cc_msg_t *new_msg;

	PDEBUG(DROUTER, DEBUG_DEBUG, "%s CC-PROGRESS-REQ from terminator.\n", relation_name(relation));

	/* if single call exists, forward progress to originator */
	if (!call->forking) {
		/* forward message to originator */
		new_msg = osmo_cc_clone_msg(old_msg);
		new_msg->type = OSMO_CC_MSG_PROGRESS_IND;
		/* send SDP answer */
		proxy_send_sdp_answer(call->relation_list, new_msg);
		osmo_cc_ll_msg(cc_ep, call->relation_list->cc_callref, new_msg);
	}
}

/* overlap dialing is received from terminating side */
static void term_overlap(call_t *call, call_relation_t *relation, osmo_cc_msg_t *old_msg)
{
	osmo_cc_msg_t *new_msg;

	PDEBUG(DROUTER, DEBUG_DEBUG, "%s CC-SETUP-ACK-REQ from terminator.\n", relation_name(relation));

	/* update call state for status display */
	relation->state = CALL_STATE_OVERLAP;
	status_needs_update = 1;

	/* notify routing */
	if (call->routing.routing)
		routing_send(&call->routing, "call-overlap");

	/* if we already reached/passed that state, we ignore it */
	if (call->state != CALL_STATE_SETUP)
		return;

	/* change state */
	new_state(call, CALL_STATE_OVERLAP);

	if (!call->forking) {
		/* forward message to originator */
		new_msg = osmo_cc_clone_msg(old_msg);
		new_msg->type = OSMO_CC_MSG_SETUP_ACK_IND;
	} else {
		/* send message to originator */
		new_msg = osmo_cc_new_msg(OSMO_CC_MSG_SETUP_ACK_IND);
	}
	/* send SDP answer */
	proxy_send_sdp_answer(call->relation_list, new_msg);
	osmo_cc_ll_msg(cc_ep, call->relation_list->cc_callref, new_msg);
}

/* proceeding is received from terminating side */
static void term_proc(call_t *call, call_relation_t *relation, osmo_cc_msg_t *old_msg)
{
	osmo_cc_msg_t *new_msg;

	PDEBUG(DROUTER, DEBUG_DEBUG, "%s CC-PROC-REQ from terminator.\n", relation_name(relation));

	/* update call state for status display */
	relation->state = CALL_STATE_PROCEEDING;
	status_needs_update = 1;

	/* notify routing */
	if (call->routing.routing)
		routing_send(&call->routing, "call-proceeding");

	/* if we already reached/passed that state, we ignore it */
	if (call->state != CALL_STATE_SETUP
	 && call->state != CALL_STATE_OVERLAP)
		return;

	/* change state */
	new_state(call, CALL_STATE_PROCEEDING);

	if (!call->forking) {
		/* forward message to originator */
		new_msg = osmo_cc_clone_msg(old_msg);
		new_msg->type = OSMO_CC_MSG_PROC_IND;
	} else {
		/* send message to originator */
		new_msg = osmo_cc_new_msg(OSMO_CC_MSG_PROC_IND);
	}
	/* send SDP answer */
	proxy_send_sdp_answer(call->relation_list, new_msg);
	osmo_cc_ll_msg(cc_ep, call->relation_list->cc_callref, new_msg);
}

/* alerting is received from terminating side */
static void term_alert(call_t *call, call_relation_t *relation, osmo_cc_msg_t *old_msg)
{
	osmo_cc_msg_t *new_msg;

	PDEBUG(DROUTER, DEBUG_DEBUG, "%s CC-ALERT-REQ from terminator.\n", relation_name(relation));

	/* update call state for status display */
	relation->state = CALL_STATE_ALERTING;
	status_needs_update = 1;

	/* notify routing */
	if (call->routing.routing)
		routing_send(&call->routing, "call-alerting");

	/* if we already reached/passed that state, we ignore it */
	if (call->state != CALL_STATE_SETUP
	 && call->state != CALL_STATE_OVERLAP
	 && call->state != CALL_STATE_PROCEEDING)
		return;

	/* change state */
	new_state(call, CALL_STATE_ALERTING);

	if (!call->forking) {
		/* forward message to originator */
		new_msg = osmo_cc_clone_msg(old_msg);
		new_msg->type = OSMO_CC_MSG_ALERT_IND;
	} else {
		/* send message to originator */
		new_msg = osmo_cc_new_msg(OSMO_CC_MSG_ALERT_IND);
	}
	/* send SDP answer */
	proxy_send_sdp_answer(call->relation_list, new_msg);
	osmo_cc_ll_msg(cc_ep, call->relation_list->cc_callref, new_msg);
}

/* connect is received from terminating side */
static void term_connect(call_t *call, call_relation_t *relation, osmo_cc_msg_t *old_msg)
{
	osmo_cc_msg_t *new_msg;
	char sdp[65536];
	int rc;

	PDEBUG(DROUTER, DEBUG_DEBUG, "%s CC-SETUP-RSP (connect) from terminator.\n", relation_name(relation));

	/* update call state for status display */
	relation->state = CALL_STATE_CONNECT;
	status_needs_update = 1;

	/* notify routing */
	if (call->routing.routing)
		routing_send(&call->routing, "call-answer");

	/* if we already reached/passed that state, we ignore it */
	if (call->state != CALL_STATE_SETUP
	 && call->state != CALL_STATE_OVERLAP
	 && call->state != CALL_STATE_PROCEEDING
	 && call->state != CALL_STATE_ALERTING) {
		PDEBUG(DROUTER, DEBUG_ERROR, "Connect message from terminating call now allowed in state '%s'.\n", state_names[call->state]);
		return;
	}

	/* change state */
	new_state(call, CALL_STATE_CONNECT);

	/* release all other relations with "non-selected user clearing" */
	while (call->relation_list->next->next) {
		call_relation_t *other;
		/* select other terminating call (not the one that answered) */
		if (call->relation_list->next == relation)
			other = call->relation_list->next->next;
		else
			other = call->relation_list->next;
		PDEBUG(DROUTER, DEBUG_DEBUG, "Sending 'non-selected user clearing' to other terminator.\n");
		/* send release message */
		new_msg = osmo_cc_new_msg(OSMO_CC_MSG_REL_IND);
		osmo_cc_add_ie_cause(new_msg, cc_ep->serving_location, OSMO_CC_ISDN_CAUSE_NONSE_USER_CLR, 0, 0);
		osmo_cc_ll_msg(cc_ep, other->cc_callref, new_msg);
		/* destroy terminating relation */
		relation_destroy(other);
	}

	/* call is not forking anymore */
	call->forking = 0;

	rc = osmo_cc_get_ie_sdp(old_msg, 0, sdp, sizeof(sdp));
	if (rc < 0)
		sdp[0] = '\0';

	/* forward message to originator */
	new_msg = osmo_cc_clone_msg(old_msg);
	new_msg->type = OSMO_CC_MSG_SETUP_CNF;
	/* only if RTP-Proxy is used */
	if (call->relation_list->rtp_proxy) {
		/* send SDP answer */
		proxy_send_sdp_answer(call->relation_list, new_msg);
	} else
	/* use earlier SDP if not included */
	if (!sdp[0] && relation->sdp)
		osmo_cc_add_ie_sdp(new_msg, relation->sdp);
	osmo_cc_ll_msg(cc_ep, call->relation_list->cc_callref, new_msg);
}

/* disconnect is received from terminating side */
static void term_disc(call_t *call, call_relation_t *relation, osmo_cc_msg_t *old_msg)
{
	osmo_cc_msg_t *new_msg;

	PDEBUG(DROUTER, DEBUG_DEBUG, "%s CC-DISC-REQ from terminator.\n", relation_name(relation));

	/* update call state for status display */
	relation->state = CALL_STATE_DISC_FROM_TERM;
	status_needs_update = 1;

	/* if we have not yet connected a call */
	if (call->state == CALL_STATE_SETUP
	 || call->state == CALL_STATE_OVERLAP
	 || call->state == CALL_STATE_PROCEEDING
	 || call->state == CALL_STATE_ALERTING) {
		uint8_t location, isdn_cause, socket_cause;
		uint16_t sip_cause;
		int rc;

		PDEBUG(DROUTER, DEBUG_DEBUG, "Got a disconnect before connect.\n");
		/* if there is only one terminating call, forward that disconnect */
		if (!call->forking) {
			PDEBUG(DROUTER, DEBUG_DEBUG, "Call is not forking, so we directly forward this disconnect.\n");
			/* notify routing */
			if (call->routing.routing)
				routing_send(&call->routing, "call-disconnect");
			/* change state */
			new_state(call, CALL_STATE_DISC_FROM_TERM);
			/* forward message to originator */
			new_msg = osmo_cc_clone_msg(old_msg);
			new_msg->type = OSMO_CC_MSG_DISC_IND;
			/* send SDP answer */
			proxy_send_sdp_answer(call->relation_list, new_msg);
			osmo_cc_ll_msg(cc_ep, call->relation_list->cc_callref, new_msg);
			return;
		}

		/* collect cause */
		PDEBUG(DROUTER, DEBUG_DEBUG, "Call is forking, so we collect ISDN cause and destroy relation.\n");
		rc = osmo_cc_get_ie_cause(old_msg, 0, &location, &isdn_cause, &sip_cause, &socket_cause);
		if (rc >= 0)
			call->collect_cause = osmo_cc_collect_cause(call->collect_cause, isdn_cause);

		/* release the terminator */
		new_msg = osmo_cc_clone_msg(old_msg);
		new_msg->type = OSMO_CC_MSG_REL_IND;
		osmo_cc_ll_msg(cc_ep, relation->cc_callref, new_msg);

		/* remove relation */
		relation_destroy(relation);

		/* if all terminating calls have been released, release the originator and destroy call */
		if (!call->relation_list->next) {
			PDEBUG(DROUTER, DEBUG_DEBUG, "All terminators have disconnected, so we forward a release with the collected cause.\n");
			new_msg = osmo_cc_new_msg(OSMO_CC_MSG_REL_IND);
			osmo_cc_add_ie_cause(new_msg, cc_ep->serving_location, call->collect_cause, 0, 0);
			osmo_cc_ll_msg(cc_ep, call->relation_list->cc_callref, new_msg);
			/* destroy call */
			call_destroy(call);
		}
		return;
	}

	/* this is connect or disconnect collision. the state implies that there is only one terminating call */
	if (call->state == CALL_STATE_CONNECT
	 || call->state == CALL_STATE_DISC_FROM_ORIG) {
		PDEBUG(DROUTER, DEBUG_DEBUG, "Got a disconnect after connect, so we directly forward this disconnect.\n");
		new_msg = osmo_cc_clone_msg(old_msg);
		new_msg->type = OSMO_CC_MSG_REL_IND;
		osmo_cc_ll_msg(cc_ep, call->relation_list->cc_callref, new_msg);
		new_msg = osmo_cc_clone_msg(old_msg);
		new_msg->type = OSMO_CC_MSG_REL_IND;
		osmo_cc_ll_msg(cc_ep, relation->cc_callref, new_msg);
		/* destroy call */
		call_destroy(call);
		return;
	}

	PDEBUG(DROUTER, DEBUG_ERROR, "Disconnect message from terminating call now allowed in state '%s'.\n", state_names[call->state]);
}

/* rel is received from terminating side */
static void term_rel(call_t *call, call_relation_t *relation, osmo_cc_msg_t *old_msg)
{
	osmo_cc_msg_t *new_msg;

	PDEBUG(DROUTER, DEBUG_DEBUG, "%s CC-REL-REQ from terminator.\n", relation_name(relation));

	/* if we have not yet connected a call */
	if (call->state == CALL_STATE_SETUP
	 || call->state == CALL_STATE_OVERLAP
	 || call->state == CALL_STATE_PROCEEDING
	 || call->state == CALL_STATE_ALERTING) {
		uint8_t location, isdn_cause, socket_cause;
		uint16_t sip_cause;
		int rc;

		PDEBUG(DROUTER, DEBUG_DEBUG, "Got a release before connect.\n");
		/* if there is only one terminating call, forward that disconnect */
		if (!call->forking) {
			PDEBUG(DROUTER, DEBUG_DEBUG, "Call is not forking, so we directly forward this release.\n");
			/* forward message to originator */
			new_msg = osmo_cc_clone_msg(old_msg);
			new_msg->type = OSMO_CC_MSG_REL_IND;
			osmo_cc_ll_msg(cc_ep, call->relation_list->cc_callref, new_msg);
			/* confirm to terminator */
			new_msg = osmo_cc_clone_msg(old_msg);
			new_msg->type = OSMO_CC_MSG_REL_CNF;
			osmo_cc_ll_msg(cc_ep, relation->cc_callref, new_msg);
			/* destroy call */
			call_destroy(call);
			return;
		}

		/* collect cause */
		PDEBUG(DROUTER, DEBUG_DEBUG, "Call is forking, so we collect ISDN cause and destroy relation.\n");
		rc = osmo_cc_get_ie_cause(old_msg, 0, &location, &isdn_cause, &sip_cause, &socket_cause);
		if (rc >= 0)
			call->collect_cause = osmo_cc_collect_cause(call->collect_cause, isdn_cause);

		/* confirm the terminator */
		new_msg = osmo_cc_clone_msg(old_msg);
		new_msg->type = OSMO_CC_MSG_REL_CNF;
		osmo_cc_ll_msg(cc_ep, relation->cc_callref, new_msg);

		/* remove relation */
		relation_destroy(relation);

		/* if all terminating calls have been released, release the originator and destroy call */
		if (!call->relation_list->next) {
			PDEBUG(DROUTER, DEBUG_DEBUG, "All terminators have released, so we forward it with the collected cause.\n");
			new_msg = osmo_cc_new_msg(OSMO_CC_MSG_REL_IND);
			osmo_cc_add_ie_cause(new_msg, cc_ep->serving_location, call->collect_cause, 0, 0);
			osmo_cc_ll_msg(cc_ep, call->relation_list->cc_callref, new_msg);
			/* destroy call */
			call_destroy(call);
		}
		return;
	}

	/* forward release to originator and confirm to terminator. the state implies that there is only one terminating call */
	if (call->state == CALL_STATE_CONNECT
	 || call->state == CALL_STATE_DISC_FROM_ORIG) {
		PDEBUG(DROUTER, DEBUG_DEBUG, "Got a release after connect, so we directly forward this release.\n");
		new_msg = osmo_cc_clone_msg(old_msg);
		new_msg->type = OSMO_CC_MSG_REL_IND;
		osmo_cc_ll_msg(cc_ep, call->relation_list->cc_callref, new_msg);
		new_msg = osmo_cc_clone_msg(old_msg);
		new_msg->type = OSMO_CC_MSG_REL_CNF;
		osmo_cc_ll_msg(cc_ep, relation->cc_callref, new_msg);
		/* destroy call */
		call_destroy(call);
		return;
	}

	PDEBUG(DROUTER, DEBUG_ERROR, "Release message from terminating call now allowed in state '%s'.\n", state_names[call->state]);
}

/* other message is received from terminating side */
static void term_other(call_t *call, call_relation_t *relation, osmo_cc_msg_t *old_msg)
{
	osmo_cc_msg_t *new_msg;

	PDEBUG(DROUTER, DEBUG_DEBUG, "%s Other CC message from terminator.\n", relation_name(relation));

	/* if there is one terminating call, forward the message */
	if (!call->relation_list->next->next) {
		new_msg = osmo_cc_clone_msg(old_msg);
		new_msg->type = old_msg->type | 1; /* convert REQ->IND, RSP->CNF */
		osmo_cc_ll_msg(cc_ep, call->relation_list->cc_callref, new_msg);
		return;
	}
}

/* handle message from upper layer */
void cc_message(osmo_cc_endpoint_t __attribute__((unused)) *ep, uint32_t callref, osmo_cc_msg_t *msg)
{
	call_t *call;
	call_relation_t *relation;
	char sdp[65536];
	int rc_sdp;

	/* hunt for callref */
	call = call_list;
	while (call) {
		relation = call->relation_list;
		while (relation) {
			if (relation->cc_callref == callref)
				break;
			relation = relation->next;
		}
		if (relation)
			break;
		call = call->next;
	}

	/* process SETUP (new call) */
	if (!call) {
		if (msg->type != OSMO_CC_MSG_SETUP_REQ) {
			PDEBUG(DROUTER, DEBUG_ERROR, "Received message without call instance, please fix!\n");
			return;
		}
		orig_setup(callref, msg);
		osmo_cc_free_msg(msg);
		return;
	}

	if (call->relation_list == relation) {
		/* handle messages from caller */
		switch (msg->type) {
		case OSMO_CC_MSG_INFO_REQ:
			orig_info(call, msg);
			break;
		case OSMO_CC_MSG_DISC_REQ:
			orig_disc(call, msg);
			break;
		case OSMO_CC_MSG_REL_REQ:
			orig_rel(call, msg);
			break;
		default:
			orig_other(call, msg);
		}
	} else {
		/* store sdp, if present */
		rc_sdp = osmo_cc_get_ie_sdp(msg, 0, sdp, sizeof(sdp));
		if (rc_sdp >= 0) {
			free((char *)relation->sdp);
			relation->sdp = strdup(sdp);
		}
		/* negotiate codec if RTP-Proxy is used and not already negotiated */
		if (call->relation_list->rtp_proxy && relation->cc_session && !relation->codec_negotiated) {
			/* remove progress, since it will be added with the SDP answer */
			osmo_cc_remove_ie(msg, OSMO_CC_IE_PROGRESS, 0);
			/* negotiate codec */
			osmo_cc_helper_audio_negotiate(msg, &relation->cc_session, &relation->codec);
			if (relation->codec)
				relation->codec_negotiated = 1;
		}
		/* remove SDP, if we do RTP-Proxy */
		if (rc_sdp >= 0 && call->relation_list->rtp_proxy)
			osmo_cc_remove_ie(msg, OSMO_CC_IE_SDP, 0);
		/* handle messages from called */
		switch (msg->type) {
		case OSMO_CC_MSG_PROGRESS_IND:
			term_progress(call, relation, msg);
			break;
		case OSMO_CC_MSG_SETUP_ACK_REQ:
			term_overlap(call, relation, msg);
			break;
		case OSMO_CC_MSG_PROC_REQ:
			term_proc(call, relation, msg);
			break;
		case OSMO_CC_MSG_ALERT_REQ:
			term_alert(call, relation, msg);
			break;
		case OSMO_CC_MSG_SETUP_RSP:
			term_connect(call, relation, msg);
			break;
		case OSMO_CC_MSG_DISC_REQ:
			term_disc(call, relation, msg);
			break;
		case OSMO_CC_MSG_REL_REQ:
		case OSMO_CC_MSG_REJ_REQ:
			term_rel(call, relation, msg);
			break;
		default:
			term_other(call, relation, msg);
		}
	}

	osmo_cc_free_msg(msg);
}

/*
 * process message from routing
 */

static const char *value_of_param(char *arg, char *param, char **value_p)
{
	if (!!strncmp(arg, param, strlen(param)))
		return NULL;
	arg += strlen(param);

	if (*arg == '\0') {
		if (value_p)
			*value_p = "";
		return "";
	}

	if (*arg != '=')
		return NULL;
	arg++;

	if (value_p)
		*value_p = arg;
	return arg;
}

static void add_codecs_by_names(struct osmo_cc_helper_audio_codecs *codecs, char *names)
{
	int c = 0, i;
	const char *name;

	while ((name = strsep(&names, ","))) {
		for (i = 0; codecs_def[i].payload_name; i++) {
			if (!strcasecmp(name, codecs_def[i].payload_name)) {
				if (c == MAX_CODECS) {
					PDEBUG(DROUTER, DEBUG_ERROR, "Maximum of %d codecs are reached. Ignoring codec '%s'.\n", c, name);
					break;
				}
				memcpy(&codecs[c], &codecs_def[i], sizeof(*codecs));
				PDEBUG(DROUTER, DEBUG_INFO, "Adding given codec '%s'.\n", codecs[c].payload_name);
				c++;
				break;
			}
		}
		if (!codecs_def[i].payload_name) {
			PDEBUG(DROUTER, DEBUG_ERROR, "Given codec '%s' not supported!\n", name);
		}
	}
	memset(&codecs[c], 0, sizeof(*codecs));
}

/* routing orders us to activate rtp proxy */
static void routing_rtp_proxy(call_t *call, int argc, char *argv[])
{
	call_relation_t *relation = call->relation_list;
	int orig_given = 0, term_given = 0;
	int i;
	char *value;

	/* ignore, if already enabled */
	if (relation->rtp_proxy) {
		PDEBUG(DROUTER, DEBUG_NOTICE, "RTP proxy is already enabled!.\n");
		return;
	}

	/* loop through all arguments and stop if there is a ':' */
	for (i = 0; i < argc ; i++) {
		if (value_of_param(argv[i], "orig-codecs", &value)) {
			PDEBUG(DROUTER, DEBUG_INFO, "Originating codecs given: '%s'.\n", value);
			add_codecs_by_names(relation->orig_codecs, value);
			if (relation->orig_codecs[0].payload_name)
				orig_given = 1;
		} else if (value_of_param(argv[i], "term-codecs", &value)) {
			PDEBUG(DROUTER, DEBUG_INFO, "Terminating codecs given: '%s'.\n", value);
			add_codecs_by_names(relation->term_codecs, value);
			if (relation->term_codecs[0].payload_name)
				term_given = 1;
		} else
			PDEBUG(DROUTER, DEBUG_ERROR, "Unknown 'rtp-proxy' parameter '%s' from routing.\n", argv[i]);
	}

	if (!orig_given) {
		memcpy(&relation->orig_codecs[0], &codecs_def[0], sizeof(relation->orig_codecs[0]));
		memcpy(&relation->orig_codecs[1], &codecs_def[1], sizeof(relation->orig_codecs[1]));
		memcpy(&relation->orig_codecs[2], &codecs_def[2], sizeof(relation->orig_codecs[2]));
		memset(&relation->orig_codecs[3], 0, sizeof(relation->orig_codecs[3]));
		PDEBUG(DROUTER, DEBUG_INFO, "No originating codeds given, using default '%s' and '%s' and '%s'.\n", relation->orig_codecs[0].payload_name, relation->orig_codecs[1].payload_name, relation->orig_codecs[2].payload_name);
	}

	if (!term_given) {
		memcpy(&relation->term_codecs[0], &codecs_def[0], sizeof(relation->term_codecs[0]));
		memcpy(&relation->term_codecs[1], &codecs_def[1], sizeof(relation->term_codecs[1]));
		memset(&relation->term_codecs[2], 0, sizeof(relation->term_codecs[2]));
		PDEBUG(DROUTER, DEBUG_INFO, "No terminating codeds given, using default '%s' and '%s'.\n", relation->term_codecs[0].payload_name, relation->term_codecs[1].payload_name);
	}

	/* error, if we already negotiated */
	if (call->sdp_forwarded) {
		PDEBUG(DROUTER, DEBUG_ERROR, "RTP-Proxy cannot be enabled now, because we already forwarded a call.\n");
		return;
	}

	/* no SDP */
	if (!relation->sdp) {
		PDEBUG(DROUTER, DEBUG_ERROR, "Originator's setup message does not contain SDP, please fix!.\n");
		return;
	}

	relation->rtp_proxy = 1;
}

/* routing orders us to play a wave file */
static void routing_play(call_t *call, int argc, char *argv[])
{
	call_relation_t *relation = call->relation_list;
	char *filename = NULL, *volume = "1.0", *loop = NULL;
	int i;
	int samplerate = 8000, channels = 0;
	double deviation;
	int rc;

	wave_destroy_playback(&relation->play);

	if (!relation->rtp_proxy) {
		PDEBUG(DROUTER, DEBUG_ERROR, "RTP-Proxy must be enabled to play a file!.\n");
		return;
	}

	/* loop through all arguments and stop if there is a ':' */
	for (i = 0; i < argc ; i++) {
		if (value_of_param(argv[i], "volume", &volume));
		else if (value_of_param(argv[i], "loop", &loop));
		else {
			if (filename) {
				PDEBUG(DROUTER, DEBUG_ERROR, "'play' command reqires only one file name, you specified '%s' and '%s'.\n", filename, argv[i]);
				return;
			}
			filename = argv[i];
		}
	}

	if (!filename) {
		PDEBUG(DROUTER, DEBUG_ERROR, "'play' command reqires a file name as parameter.\n");
		return;
	}

	deviation = 1.0 / SPEECH_LEVEL * atof(volume);
	rc = wave_create_playback(&relation->play, filename, &samplerate, &channels, deviation);
	if (rc < 0)
		return;
	strncpy(relation->play_filename, filename, sizeof(relation->play_filename) - 1);
	relation->play_deviation = deviation;


	if (channels != 1 && channels != 2) {
		wave_destroy_playback(&relation->play);
		PDEBUG(DROUTER, DEBUG_ERROR, "'play' command reqires a wave file that has 1 or 2 channels only.\n");
		return;
	}

	if (loop)
		relation->play_loop = 1;
}

/* routing orders us stop playing a wave file */
static void routing_play_stop(call_t *call)
{
	call_relation_t *relation = call->relation_list;

	wave_destroy_playback(&relation->play);
}

/* routing orders us to record a wave file */
static void routing_record(call_t *call, int argc, char *argv[])
{
	call_relation_t *relation = call->relation_list;
	char *filename = NULL, *volume = "1.0";
	int i;
	int samplerate = 8000, channels = 2;
	int rc;

	wave_destroy_record(&relation->rec);

	if (!relation->rtp_proxy) {
		PDEBUG(DROUTER, DEBUG_ERROR, "RTP-Proxy must be enabled to record a file!.\n");
		return;
	}

	/* loop through all arguments and stop if there is a ':' */
	for (i = 0; i < argc ; i++) {
		if (value_of_param(argv[i], "volume", &volume));
		else {
			if (filename) {
				PDEBUG(DROUTER, DEBUG_ERROR, "'record' command reqires only one file name, you specified '%s' and '%s'.\n", filename, argv[i]);
				return;
			}
			filename = argv[i];
		}
	}

	if (!filename) {
		PDEBUG(DROUTER, DEBUG_ERROR, "'record' command reqires a file name as parameter.\n");
		return;
	}

	rc = wave_create_record(&relation->rec, filename, samplerate, channels, 1.0 / SPEECH_LEVEL / atof(volume));
	if (rc < 0)
		return;
}

/* routing orders us stop recording a wave file */
static void routing_record_stop(call_t *call)
{
	call_relation_t *relation = call->relation_list;

	wave_destroy_record(&relation->rec);
}

/* routing orders us to set local gain */
static void routing_gain(call_t *call, int argc, char *argv[], int tx)
{
	int i;
	char *gain = NULL;

	if (!call->relation_list->rtp_proxy) {
		PDEBUG(DROUTER, DEBUG_ERROR, "RTP-Proxy must be enabled to record a file!\n");
		return;
	}

	/* loop through all arguments and stop if there is a ':' */
	for (i = 0; i < argc ; i++) {
		if (gain) {
			PDEBUG(DROUTER, DEBUG_ERROR, "'%s-gain' command reqires only parameter, you specified '%s' and '%s'.\n", (tx) ? "tx" : "rx", gain, argv[i]);
			return;
		}
		gain = argv[i];
	}

	if (!gain) {
		PDEBUG(DROUTER, DEBUG_ERROR, "'%s-gain' command reqires a gain value as parameter.\n", (tx) ? "tx" : "rx");
		return;
	}

	if (tx)
		call->tx_gain = atof(gain);
	else
		call->rx_gain = atof(gain);

}

/* routing orders us to call remote end */
static void routing_call(call_t *call, int argc, char *argv[])
{
	char *interface;
	char *bearer_coding, *bearer_capability, *bearer_mode;
	char *calling, *calling_type, *calling_plan, *calling_present, *calling_screen, *no_calling;
	char *calling2, *calling2_type, *calling2_plan, *calling2_present, *calling2_screen, *no_calling2;
	char *redirecting, *redirecting_type, *redirecting_plan, *redirecting_present, *redirecting_screen, *redirecting_reason, *no_redirecting;
	char *dialing, *dialing_type, *dialing_plan;
	char *keypad;
	uint8_t coding, capability, mode;
	uint8_t type, plan, present, screen, reason;
	char number[256];
	int i, rc, calls = 0;
	osmo_cc_msg_t *new_msg, *setup_msg;

	/* if we have a call, we don't add more terminators */
	if (call->relation_list->next) {
		PDEBUG(DROUTER, DEBUG_ERROR, "Multiple call commands from routing are not allowed.\n");
		return;
	}

	setup_msg = call->setup_msg;

next_call:
	interface = NULL;
	bearer_coding = bearer_capability = bearer_mode = NULL;
	calling = calling_type = calling_plan = calling_present = calling_screen = no_calling = NULL;
	calling2 = calling2_type = calling2_plan = calling2_present = calling2_screen = no_calling2 = NULL;
	redirecting = redirecting_type = redirecting_plan = redirecting_present = redirecting_screen = redirecting_reason = no_redirecting = NULL;
	dialing = dialing_type = dialing_plan = NULL;
	keypad = NULL;
	/* loop through all arguments and stop if there is a ':' */
	for (i = 0; i < argc && argv[i][0] != ':'; i++) {
		if (value_of_param(argv[i], "interface", &interface));
		else if (value_of_param(argv[i], "bearer-coding", &bearer_coding));
		else if (value_of_param(argv[i], "bearer-capability", &bearer_capability));
		else if (value_of_param(argv[i], "bearer-mode", &bearer_mode));
		else if (value_of_param(argv[i], "calling", &calling));
		else if (value_of_param(argv[i], "calling-type", &calling_type));
		else if (value_of_param(argv[i], "calling-plan", &calling_plan));
		else if (value_of_param(argv[i], "calling-present", &calling_present));
		else if (value_of_param(argv[i], "calling-screen", &calling_screen));
		else if (value_of_param(argv[i], "no-calling", &no_calling));
		else if (value_of_param(argv[i], "calling2", &calling2));
		else if (value_of_param(argv[i], "calling2-type", &calling2_type));
		else if (value_of_param(argv[i], "calling2-plan", &calling2_plan));
		else if (value_of_param(argv[i], "calling2-present", &calling2_present));
		else if (value_of_param(argv[i], "calling2-screen", &calling2_screen));
		else if (value_of_param(argv[i], "no-calling2", &no_calling2));
		else if (value_of_param(argv[i], "redirecting", &redirecting));
		else if (value_of_param(argv[i], "redirecting-type", &redirecting_type));
		else if (value_of_param(argv[i], "redirecting-plan", &redirecting_plan));
		else if (value_of_param(argv[i], "redirecting-present", &redirecting_present));
		else if (value_of_param(argv[i], "redirecting-screen", &redirecting_screen));
		else if (value_of_param(argv[i], "redirecting-reason", &redirecting_reason));
		else if (value_of_param(argv[i], "no-redirecting", &no_redirecting));
		else if (value_of_param(argv[i], "dialing", &dialing));
		else if (value_of_param(argv[i], "dialing-type", &dialing_type));
		else if (value_of_param(argv[i], "dialing-plan", &dialing_plan));
		else if (value_of_param(argv[i], "keypad", &keypad));
		else
			PDEBUG(DROUTER, DEBUG_ERROR, "Unknown 'call' parameter '%s' from routing.\n", argv[i]);
	}
	/* if more calls, then forward arguments behind colon, otherwise set argc to 0 */
	if (i < argc) {
		argv += i + 1;
		argc -= i + 1;
	} else
		argc = 0;

	if (!interface) {
		PDEBUG(DROUTER, DEBUG_ERROR, "'call' command without 'interface' parameter.\n");
		goto try_next;
	}

	calls++;

	/* set call forking, if we have more than one terminating call */
	if (calls > 1)
		call->forking = 1;

	/* create endpoint */
	osmo_cc_call_t *cc_call = osmo_cc_call_new(cc_ep);
	call_relation_t *relation = relation_create(call);

	/* link with cc */
	relation->cc_callref = cc_call->callref;

	PDEBUG(DROUTER, DEBUG_DEBUG, "%s CC-SETUP-IND to terminator.\n", relation_name(relation));

	/* create setup message */
	new_msg = osmo_cc_new_msg(OSMO_CC_MSG_SETUP_IND);

	/* interface name */
	osmo_cc_add_ie_called_interface(new_msg, interface);

	/* bearer capability */
	rc = osmo_cc_get_ie_bearer(setup_msg, 0, &coding, &capability, &mode);
	if (rc >= 0 || bearer_coding || bearer_capability || bearer_mode) {
		/* if not preset, use default values */
		if (rc < 0) {
			coding = OSMO_CC_CODING_ITU_T;
			capability = OSMO_CC_CAPABILITY_AUDIO;
			mode = OSMO_CC_MODE_CIRCUIT;
		}
		/* alter values */
		if (bearer_coding)
			coding = atoi(bearer_coding);
		if (bearer_capability)
			capability = atoi(bearer_capability);
		if (bearer_mode)
			mode = atoi(bearer_coding);
		osmo_cc_add_ie_bearer(new_msg, coding, capability, mode);
	}

	/* calling */
	if (!no_calling) {
		rc = osmo_cc_get_ie_calling(setup_msg, 0, &type, &plan, &present, &screen, number, sizeof(number));
		if (rc >= 0 || calling_type || calling_plan || calling_present || calling_screen || calling) {
			/* if not preset, use default values */
			if (rc < 0) {
				type = OSMO_CC_TYPE_UNKNOWN;
				plan = OSMO_CC_PLAN_TELEPHONY;
				present = 0;
				screen = 0;
				number[0] = '\0';
			}
			/* alter values */
			if (calling_type)
				type = atoi(calling_type);
			if (calling_plan)
				plan = atoi(calling_plan);
			if (calling_present)
				present = atoi(calling_present);
			if (calling_screen)
				screen = atoi(calling_screen);
			if (!calling)
				calling = number;
			osmo_cc_add_ie_calling(new_msg, type, plan, present, screen, calling);
		}
	}
	if (!no_calling && !no_calling2) {
		rc = osmo_cc_get_ie_calling(setup_msg, 1, &type, &plan, &present, &screen, number, sizeof(number));
		if (rc >= 0 || calling2_type || calling2_plan || calling2_present || calling2_screen || calling2) {
			/* if not preset, use default values */
			if (rc < 0) {
				type = OSMO_CC_TYPE_UNKNOWN;
				plan = OSMO_CC_PLAN_TELEPHONY;
				present = 0;
				screen = 0;
				number[0] = '\0';
			}
			/* alter values */
			if (calling2_type)
				type = atoi(calling2_type);
			if (calling2_plan)
				plan = atoi(calling2_plan);
			if (calling2_present)
				present = atoi(calling2_present);
			if (calling2_screen)
				screen = atoi(calling2_screen);
			if (!calling2)
				calling2 = number;
			osmo_cc_add_ie_calling(new_msg, type, plan, present, screen, calling2);
		}
	}

	/* redirecting */
	if (!no_redirecting) {
		rc = osmo_cc_get_ie_redir(setup_msg, 0, &type, &plan, &present, &screen, &reason, number, sizeof(number));
		if (rc >= 0 || redirecting_type || redirecting_plan || redirecting_present || redirecting_screen || redirecting) {
			/* if not preset, use default values */
			if (rc < 0) {
				type = OSMO_CC_TYPE_UNKNOWN;
				plan = OSMO_CC_PLAN_TELEPHONY;
				present = 0;
				screen = 0;
				reason = OSMO_CC_REDIR_REASON_UNKNOWN;
				number[0] = '\0';
			}
			/* alter values */
			if (redirecting_type)
				type = atoi(redirecting_type);
			if (redirecting_plan)
				plan = atoi(redirecting_plan);
			if (redirecting_present)
				present = atoi(redirecting_present);
			if (redirecting_screen)
				screen = atoi(redirecting_screen);
			if (!redirecting)
				redirecting = number;
			osmo_cc_add_ie_redir(new_msg, type, plan, present, screen, reason, redirecting);
		}
	}

	/* dialing */
	rc = osmo_cc_get_ie_called(setup_msg, 0, &type, &plan, number, sizeof(number));
	if (rc >= 0 || dialing_type || dialing_plan || dialing) {
		/* if not preset, use default values */
		if (rc < 0) {
			type = OSMO_CC_TYPE_UNKNOWN;
			plan = OSMO_CC_PLAN_TELEPHONY;
		}
		/* alter values */
		if (dialing_type)
			type = atoi(dialing_type);
		if (dialing_plan)
			plan = atoi(dialing_plan);
		if (!dialing)
			dialing = "";
		osmo_cc_add_ie_called(new_msg, type, plan, dialing);
	}

	/* keypad */
	if (keypad) {
		if (keypad[0])
			osmo_cc_add_ie_keypad(new_msg, keypad);
	}

	/* only if RTP-Proxy is used */
	if (call->relation_list->rtp_proxy) {
		PDEBUG(DROUTER, DEBUG_DEBUG, "Sending our codecs to the terminator.\n");
		relation->cc_session = osmo_cc_helper_audio_offer(relation, call->relation_list->term_codecs, receive_terminator, new_msg, 1);
	} else
	/* sdp from originator's setup message */
	if (call->relation_list->sdp)
		osmo_cc_add_ie_sdp(new_msg, call->relation_list->sdp);

	/* send message to osmo-cc */
	osmo_cc_ll_msg(cc_ep, relation->cc_callref, new_msg);

	/* remember this, since we cannot do RTP-Proxy after */
	call->sdp_forwarded = 1;

	/* store peer info for status */
	strncpy(relation->interface, interface, sizeof(relation->interface) - 1);
	strncpy(relation->id, dialing, sizeof(relation->id) - 1);

	/* update call state for status display */
	relation->state = CALL_STATE_SETUP;
	status_needs_update = 1;

try_next:
	/* there is another call */
	if (argc)
		goto next_call;
}

/* routing orders us to hangup all terminating calls */
static void routing_call_stop(call_t *call)
{
	call_relation_t *relation;
	osmo_cc_msg_t *new_msg;

	/* send message to all terminators, if any */
	while (call->relation_list->next) {
		relation = call->relation_list->next;
		PDEBUG(DROUTER, DEBUG_DEBUG, "%s CC-REL-IND to terminator.\n", relation_name(relation));
		new_msg = osmo_cc_new_msg(OSMO_CC_MSG_REL_IND);
		osmo_cc_add_ie_cause(new_msg, cc_ep->serving_location, OSMO_CC_ISDN_CAUSE_NORM_CALL_CLEAR, 0, 0);
		osmo_cc_ll_msg(cc_ep, relation->cc_callref, new_msg);
		relation_destroy(relation);
	}
}

/* routing orders us to set call into overlap state */
static void routing_overlap(call_t *call)
{
	call_relation_t *relation = call->relation_list;
	osmo_cc_msg_t *new_msg;

	if (call->state != CALL_STATE_SETUP)
		return;

	new_state(call, CALL_STATE_OVERLAP);

	PDEBUG(DROUTER, DEBUG_DEBUG, "%s CC-SETUP-ACK-IND to originator.\n", relation_name(relation));

	/* send message to originator */
	new_msg = osmo_cc_new_msg(OSMO_CC_MSG_SETUP_ACK_IND);

	/* send SDP answer */
	proxy_send_sdp_answer(relation, new_msg);

	osmo_cc_ll_msg(cc_ep, relation->cc_callref, new_msg);
}

/* routing orders us to set call into proceeding state */
static void routing_proceeding(call_t *call)
{
	call_relation_t *relation = call->relation_list;
	osmo_cc_msg_t *new_msg;

	if (call->state != CALL_STATE_SETUP
	 && call->state != CALL_STATE_OVERLAP)
		return;

	new_state(call, CALL_STATE_PROCEEDING);

	PDEBUG(DROUTER, DEBUG_DEBUG, "%s CC-PROC-IND to originator.\n", relation_name(relation));

	/* send message to originator */
	new_msg = osmo_cc_new_msg(OSMO_CC_MSG_PROC_IND);

	/* send SDP answer */
	proxy_send_sdp_answer(relation, new_msg);

	osmo_cc_ll_msg(cc_ep, relation->cc_callref, new_msg);
}

/* routing orders us to set call into alerting state */
static void routing_alerting(call_t *call)
{
	call_relation_t *relation = call->relation_list;
	osmo_cc_msg_t *new_msg;

	if (call->state != CALL_STATE_SETUP
	 && call->state != CALL_STATE_OVERLAP
	 && call->state != CALL_STATE_PROCEEDING)
		return;

	new_state(call, CALL_STATE_ALERTING);

	PDEBUG(DROUTER, DEBUG_DEBUG, "%s CC-ALERT-IND to originator.\n", relation_name(relation));

	/* send message to originator */
	new_msg = osmo_cc_new_msg(OSMO_CC_MSG_ALERT_IND);

	/* send SDP answer */
	proxy_send_sdp_answer(relation, new_msg);

	osmo_cc_ll_msg(cc_ep, relation->cc_callref, new_msg);
}

/* routing orders us to set call into answer state */
static void routing_answer(call_t *call)
{
	call_relation_t *relation = call->relation_list;
	osmo_cc_msg_t *new_msg;

	if (call->state != CALL_STATE_SETUP
	 && call->state != CALL_STATE_OVERLAP
	 && call->state != CALL_STATE_PROCEEDING
	 && call->state != CALL_STATE_ALERTING)
		return;

	PDEBUG(DROUTER, DEBUG_DEBUG, "%s CC-SETUP-CNF to originator.\n", relation_name(relation));

	new_state(call, CALL_STATE_CONNECT);

	/* send message to originator */
	new_msg = osmo_cc_new_msg(OSMO_CC_MSG_SETUP_CNF);

	/* send SDP answer */
	proxy_send_sdp_answer(relation, new_msg);

	osmo_cc_ll_msg(cc_ep, relation->cc_callref, new_msg);
}

/* routing orders us to dsiconnect/release the call */
static void routing_disc_rel(call_t *call, int argc, char *argv[], int disconnect)
{
	call_relation_t *relation = call->relation_list;
	char *cause_str;
	uint8_t cause = 16;
	osmo_cc_msg_t *new_msg;
	int i;

	/* get cause, if any */
	for (i = 0; i < argc; i++) {
		if (value_of_param(argv[i], "cause", &cause_str))
			cause = atoi(cause_str);
		else
			PDEBUG(DROUTER, DEBUG_ERROR, "Unknown 'disconnect' / 'release' parameter '%s' from routing.\n", argv[i]);
	}

	PDEBUG(DROUTER, DEBUG_DEBUG, "%s CC-%s-IND to originator.\n", relation_name(relation), (disconnect) ? "DISC" : "REL");

	/* send message to originator */
	new_msg = osmo_cc_new_msg((disconnect) ? OSMO_CC_MSG_DISC_IND : OSMO_CC_MSG_REL_IND);
	if (disconnect) {
		/* send SDP answer */
		proxy_send_sdp_answer(relation, new_msg);
	}
	/* add cause */
	osmo_cc_add_ie_cause(new_msg, cc_ep->serving_location, cause, 0, 0);
	osmo_cc_ll_msg(cc_ep, relation->cc_callref, new_msg);

	/* send message to all terminators, if any */
	for (relation = relation->next; relation; relation = relation->next) {
		PDEBUG(DROUTER, DEBUG_DEBUG, "%s CC-REL-IND to terminator.\n", relation_name(relation));
		new_msg = osmo_cc_new_msg(OSMO_CC_MSG_REL_IND);
		/* add cause */
		osmo_cc_add_ie_cause(new_msg, cc_ep->serving_location, OSMO_CC_ISDN_CAUSE_NORM_CALL_CLEAR, 0, 0);
		osmo_cc_ll_msg(cc_ep, relation->cc_callref, new_msg);
	}

	if (!disconnect) {
		/* destroy call */
		call_destroy(call);
	}
}

#define db2level(db)    pow(10, (double)(db) / 20.0)

void recv_dtmf(void *priv, char digit, dtmf_meas_t __attribute__((unused)) *meas)
{
	call_relation_t *relation = (call_relation_t *)priv;
	char digit_string[7] = "dtmf x";

	if (!relation->call->routing.routing)
		return;

	digit_string[5] = digit;
	routing_send(&relation->call->routing, digit_string);
}

/* routing orders us to enable DTMF decoding */
static void routing_dtmf(call_t *call)
{
	call_relation_t *relation = call->relation_list;

	dtmf_decode_exit(&relation->dtmf_dec);

	/* we add 13, because we working at speech level and not at 0dBm, which is -13 dBm */
	dtmf_decode_init(&relation->dtmf_dec, relation, recv_dtmf, 8000, db2level(6.0 + 13.0), db2level(-30.0 + 13.0));

	relation->dtmf_dec_enable = 1;
}

/* routing orders us to disable DTMF decoding */
static void routing_dtmf_stop(call_t *call)
{
	call_relation_t *relation = call->relation_list;

	dtmf_decode_exit(&relation->dtmf_dec);

	relation->dtmf_dec_enable = 0;
}

/* routing failed, release the call */
static void routing_error(call_t *call, char *error)
{
	osmo_cc_msg_t *new_msg;
	call_relation_t *relation;

	PDEBUG(DROUTER, DEBUG_ERROR, "Routing script error: '%s'\n", error);

	/* send message to originator */
	new_msg = osmo_cc_new_msg(OSMO_CC_MSG_REL_IND);
	osmo_cc_add_ie_cause(new_msg, cc_ep->serving_location, OSMO_CC_ISDN_CAUSE_NETWORK_OOO, 0, 0);
	osmo_cc_ll_msg(cc_ep, call->relation_list->cc_callref, new_msg);

	/* send message to all terminators, if any */
	for (relation = call->relation_list->next; relation; relation = relation->next) {
		new_msg = osmo_cc_new_msg(OSMO_CC_MSG_REL_IND);
		osmo_cc_add_ie_cause(new_msg, cc_ep->serving_location, OSMO_CC_ISDN_CAUSE_NETWORK_OOO, 0, 0);
		osmo_cc_ll_msg(cc_ep, relation->cc_callref, new_msg);
	}
}

#if 0
/* routing script says something */
static void routing_say(call_t *call, char *error)
{
	char text[1024] = "";
	fuer alle argv
		fuege text hinzu
	PDEBUG(DROUTER, DEBUG_NOTICE, "Routing script says: %s\n", text);
	das script anpassen
}
#endif

void routing_receive_stdout(routing_t *routing, const char *string)
{
	call_t *call = routing->call;
	int argc = 0;
	char *argv[256], *token;

	/* convert string into tokens */
	while ((token = osmo_cc_strtok_quotes(&string)))
		argv[argc++] = strdup(token);
	if (!argc)
		return;

	if (!strcasecmp(argv[0], "rtp-proxy"))
		routing_rtp_proxy(call, argc - 1, argv + 1);
	else
	if (!strcasecmp(argv[0], "play"))
		routing_play(call, argc - 1, argv + 1);
	else
	if (!strcasecmp(argv[0], "play-stop"))
		routing_play_stop(call);
	else
	if (!strcasecmp(argv[0], "record"))
		routing_record(call, argc - 1, argv + 1);
	else
	if (!strcasecmp(argv[0], "record-stop"))
		routing_record_stop(call);
	else
	if (!strcasecmp(argv[0], "tx-gain"))
		routing_gain(call, argc - 1, argv + 1, 1);
	else
	if (!strcasecmp(argv[0], "rx-gain"))
		routing_gain(call, argc - 1, argv + 1, 0);
	else
	if (!strcasecmp(argv[0], "call"))
		routing_call(call, argc - 1, argv + 1);
	else
	if (!strcasecmp(argv[0], "call-stop"))
		routing_call_stop(call);
	else
	if (!strcasecmp(argv[0], "overlap"))
		routing_overlap(call);
	else
	if (!strcasecmp(argv[0], "proceeding"))
		routing_proceeding(call);
	else
	if (!strcasecmp(argv[0], "alerting"))
		routing_alerting(call);
	else
	if (!strcasecmp(argv[0], "answer"))
		routing_answer(call);
	else
	if (!strcasecmp(argv[0], "disconnect"))
		routing_disc_rel(call, argc - 1, argv + 1, 1);
	else
	if (!strcasecmp(argv[0], "release"))
		routing_disc_rel(call, argc - 1, argv + 1, 0);
	else
	if (!strcasecmp(argv[0], "dtmf"))
		routing_dtmf(call);
	else
	if (!strcasecmp(argv[0], "dtmf-stop"))
		routing_dtmf_stop(call);
	else
	if (!strcasecmp(argv[0], "error"))
		routing_error(call, (argc > 1) ? argv[1] : "<unknown>");
	else
#if 0
	if (!strcasecmp(argv[0], "say"))
		routing_say(call, argc - 1, argv + 1, 0);
	else
#endif
		PDEBUG(DROUTER, DEBUG_ERROR, "Unknown command '%s' from routing.\n", argv[0]);

	while (argc)
		free((char *)argv[--argc]);
}

void routing_receive_stderr(routing_t *routing, const char *string)
{
	if (routing->call->relation_list)
		PDEBUG(DSTDERR, DEBUG_NOTICE, "(call #%d) Routing STDERR: %s\n", routing->call->num, string);
	else
		PDEBUG(DSTDERR, DEBUG_NOTICE, "Routing STDERR: %s\n", string);
}

void routing_close(routing_t *routing) 
{
	call_t *call = routing->call;

	osmo_cc_msg_t *new_msg;

	PDEBUG(DROUTER, DEBUG_INFO, "(call #%d) Routing script exitted.\n", call->num);

	/* if we have a terminating call, it is fine to continue without routing process */
	if (call->relation_list->next)
		return;

	/* in setup state we change to overlap state, so that routing can be restartet with dialing information added */
	if (call->state == CALL_STATE_SETUP) {
		/* change state */
		new_state(call, CALL_STATE_OVERLAP);
		/* forward message to originator */
		new_msg = osmo_cc_new_msg(OSMO_CC_MSG_SETUP_ACK_IND);
		osmo_cc_ll_msg(cc_ep, call->relation_list->cc_callref, new_msg);
		return;
	}

	/* in overlap state we wait for more information to be added */
	if (call->state == CALL_STATE_OVERLAP) {
		return;
	}

	/* there is no way to dial more digits, so we release the call */
	new_msg = osmo_cc_new_msg(OSMO_CC_MSG_REL_IND);
	osmo_cc_add_ie_cause(new_msg, cc_ep->serving_location, OSMO_CC_ISDN_CAUSE_NO_ROUTE, 0, 0);
	osmo_cc_ll_msg(cc_ep, call->relation_list->cc_callref, new_msg);

	/* destroy call */
	call_destroy(call);
}

void telephone_event(call_relation_t *relation, struct telephone_event *te)
{
	char digit_string[7] = "dtmf x";

	if (te->event < 16) {
		if (!relation->te_started && !te->e && te->volume <= 36) {
			PDEBUG(DROUTER, DEBUG_INFO, "Received start of Telephone-Event '%d'\n", te->event);
			relation->te_started = 1;
			digit_string[5] = "0123456789*#ABCD"[te->event];
		}
		if (relation->te_started && te->e) {
			PDEBUG(DROUTER, DEBUG_INFO, "Received end of Telephone-Event '%d'\n", te->event);
			relation->te_started = 0;
		}
	} else
		PDEBUG(DROUTER, DEBUG_INFO, "Received unsupported Telephone-Event '%d'\n", te->event);

	if (!relation->call->routing.routing)
		return;

	if (digit_string[5] != 'x')
		routing_send(&relation->call->routing, digit_string);
}

#warning add progress, if terminating call sends sdp but call state already reached

#warning beim disc muss progress geprueft werden und damit entschieden ob wir audio mitsenden sollen