MNCC<->SIP bridge; attaches to OsmoMSC to interface with external SIP VoIP telephony https://osmocom.org/projects/osmo-sip-conector
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osmo-sip-connector/src/app.c

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2.8 KiB

/*
* (C) 2016 by Holger Hans Peter Freyther
*
* All Rights Reserved
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Affero 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 Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
#include "app.h"
#include "call.h"
#include "logging.h"
#include "mncc.h"
#include "mncc_protocol.h"
void app_mncc_disconnected(struct mncc_connection *conn)
{
struct call *call, *tmp;
llist_for_each_entry_safe(call, tmp, &g_call_list, entry) {
struct call_leg *initial, *remote;
int has_mncc = 0;
if (call->initial && call->initial->type == CALL_TYPE_MNCC)
has_mncc = 1;
if (call->remote && call->remote->type == CALL_TYPE_MNCC)
has_mncc = 1;
if (!has_mncc)
continue;
/*
* this call has a MNCC component and we will release it now.
* There might be no remote so on the release of the initial
* leg the call might be gone. We may not touch call beyond
* that point.
*/
LOGP(DAPP, LOGL_NOTICE,
"Going to release call(%u) due MNCC.\n", call->id);
initial = call->initial;
remote = call->remote;
call = NULL;
if (initial)
initial->release_call(initial);
if (remote)
remote->release_call(remote);
}
}
/*
* I hook SIP and MNCC together.
*/
void app_setup(struct app_config *cfg)
{
cfg->mncc.conn.on_disconnect = app_mncc_disconnected;
}
static void route_to_sip(struct call *call)
{
if (sip_create_remote_leg(&g_app.sip.agent, call) != 0)
call->initial->release_call(call->initial);
}
static void route_to_mncc(struct call *call)
{
if (mncc_create_remote_leg(&g_app.mncc.conn, call) != 0)
call->initial->release_call(call->initial);
}
void app_route_call(struct call *call, const char *source, const char *dest)
{
if (!source || !dest) {
LOGP(DAPP, LOGL_ERROR, "call(%u) missing source(%p)/dest(%p)\n",
call->id, source, dest);
call->initial->release_call(call->initial);
return;
}
call->source = source;
call->dest = dest;
if (call->initial->type == CALL_TYPE_MNCC)
route_to_sip(call);
else
route_to_mncc(call);
}
const char *app_media_name(int ptmsg)
{
if (ptmsg == GSM_TCHF_FRAME)
return "GSM";
if (ptmsg == GSM_TCHF_FRAME_EFR)
return "GSM-EFR";
if (ptmsg == GSM_TCHH_FRAME)
return "GSM-HR-08";
if (ptmsg == GSM_TCH_FRAME_AMR)
return "AMR";
LOGP(DAPP, LOGL_ERROR, "Unknown ptmsg(%d). call broken\n", ptmsg);
return "unknown";
}