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Makefile
Makefile.in
.deps
.libs
*.o
*.lo
*.la
*.pc
aclocal.m4
acinclude.m4
aminclude.am
m4/*.m4
autom4te.cache
compile
config.h*
config.sub
config.log
config.status
config.guess
configure
depcomp
missing
ltmain.sh
install-sh
stamp-h1
libtool
.tarball-version
.version
.dirstamp
Doxyfile
.*.sw?
src/libdebug/libdebug.a
src/libg711/libg711.a
src/libjitter/libjitter.a
src/libfm/libfm.a
src/libdtmf/libdtmf.a
src/libfsk/libfsk.a
src/liboptions/liboptions.a
src/libosmocc/libosmocc.a
src/libsample/libsample.a
src/libfilter/libfilter.a
src/libtimer/libtimer.a
src/libph_socket/libph_socket.a
src/pstn/osmo-cc-pstn-endpoint

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If the program does terminal interaction, make it output a short
notice like this when it starts in an interactive mode:
<program> Copyright (C) <year> <name of author>
This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
This is free software, and you are welcome to redistribute it
under certain conditions; type `show c' for details.
The hypothetical commands `show w' and `show c' should show the appropriate
parts of the General Public License. Of course, your program's commands
might be different; for a GUI interface, you would use an "about box".
You should also get your employer (if you work as a programmer) or school,
if any, to sign a "copyright disclaimer" for the program, if necessary.
For more information on this, and how to apply and follow the GNU GPL, see
<http://www.gnu.org/licenses/>.
The GNU General Public License does not permit incorporating your program
into proprietary programs. If your program is a subroutine library, you
may consider it more useful to permit linking proprietary applications with
the library. If this is what you want to do, use the GNU Lesser General
Public License instead of this License. But first, please read
<http://www.gnu.org/philosophy/why-not-lgpl.html>.

5
Makefile.am
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AUTOMAKE_OPTIONS = foreign dist-bzip2 1.6
ACLOCAL_AMFLAGS = -I m4
SUBDIRS = src

95
configure.ac
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AC_INIT([osmo-cc-pstn-endpoint],
m4_esyscmd([./git-version-gen .tarball-version]),
[jolly@eversberg.eu])
dnl *This* is the root dir, even if an install-sh exists in ../ or ../../
AC_CONFIG_AUX_DIR([.])
AM_INIT_AUTOMAKE([subdir-objects dist-bzip2])
AC_CONFIG_TESTDIR(tests)
dnl kernel style compile messages
m4_ifdef([AM_SILENT_RULES], [AM_SILENT_RULES([yes])])
dnl include release helper
RELMAKE='-include osmo-release.mk'
AC_SUBST([RELMAKE])
dnl checks for programs
AC_PROG_MAKE_SET
AC_PROG_CC
AC_PROG_INSTALL
AC_PROG_RANLIB
AC_CONFIG_MACRO_DIR([m4])
AC_ARG_ENABLE(sanitize,
[AS_HELP_STRING(
[--enable-sanitize],
[Compile with address sanitizer enabled],
)],
[sanitize=$enableval], [sanitize="no"])
if test x"$sanitize" = x"yes"
then
CFLAGS="$CFLAGS -fsanitize=address -fsanitize=undefined"
CPPFLAGS="$CPPFLAGS -fsanitize=address -fsanitize=undefined"
fi
AC_ARG_ENABLE(werror,
[AS_HELP_STRING(
[--enable-werror],
[Turn all compiler warnings into errors, with exceptions:
a) deprecation (allow upstream to mark deprecation without breaking builds);
b) "#warning" pragmas (allow to remind ourselves of errors without breaking builds)
]
)],
[werror=$enableval], [werror="no"])
if test x"$werror" = x"yes"
then
WERROR_FLAGS="-Werror"
WERROR_FLAGS+=" -Wno-error=deprecated -Wno-error=deprecated-declarations"
WERROR_FLAGS+=" -Wno-error=cpp" # "#warning"
CFLAGS="$CFLAGS $WERROR_FLAGS"
CPPFLAGS="$CPPFLAGS $WERROR_FLAGS"
fi
CFLAGS="$CFLAGS -Wall"
CPPFLAGS="$CPPFLAGS -Wall"
dnl checks for header files
AC_HEADER_STDC
AC_CHECK_HEADERS(execinfo.h sys/select.h sys/socket.h syslog.h ctype.h)
# The following test is taken from WebKit's webkit.m4
saved_CFLAGS="$CFLAGS"
CFLAGS="$CFLAGS -fvisibility=hidden "
AC_MSG_CHECKING([if ${CC} supports -fvisibility=hidden])
AC_COMPILE_IFELSE([AC_LANG_SOURCE([char foo;])],
[ AC_MSG_RESULT([yes])
SYMBOL_VISIBILITY="-fvisibility=hidden"],
AC_MSG_RESULT([no]))
CFLAGS="$saved_CFLAGS"
AC_SUBST(SYMBOL_VISIBILITY)
dnl Generate the output
AM_CONFIG_HEADER(config.h)
AC_CHECK_LIB([m], [main])
AC_CHECK_LIB([pthread], [main])
AC_OUTPUT(
src/liboptions/Makefile
src/libdebug/Makefile
src/libsample/Makefile
src/libfsk/Makefile
src/libdtmf/Makefile
src/libfm/Makefile
src/libfilter/Makefile
src/libtimer/Makefile
src/libjitter/Makefile
src/libosmocc/Makefile
src/libg711/Makefile
src/libph_socket/Makefile
src/pstn/Makefile
src/Makefile
Makefile)

151
git-version-gen
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#!/bin/sh
# Print a version string.
scriptversion=2010-01-28.01
# Copyright (C) 2007-2010 Free Software Foundation, Inc.
#
# 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/>.
# This script is derived from GIT-VERSION-GEN from GIT: http://git.or.cz/.
# It may be run two ways:
# - from a git repository in which the "git describe" command below
# produces useful output (thus requiring at least one signed tag)
# - from a non-git-repo directory containing a .tarball-version file, which
# presumes this script is invoked like "./git-version-gen .tarball-version".
# In order to use intra-version strings in your project, you will need two
# separate generated version string files:
#
# .tarball-version - present only in a distribution tarball, and not in
# a checked-out repository. Created with contents that were learned at
# the last time autoconf was run, and used by git-version-gen. Must not
# be present in either $(srcdir) or $(builddir) for git-version-gen to
# give accurate answers during normal development with a checked out tree,
# but must be present in a tarball when there is no version control system.
# Therefore, it cannot be used in any dependencies. GNUmakefile has
# hooks to force a reconfigure at distribution time to get the value
# correct, without penalizing normal development with extra reconfigures.
#
# .version - present in a checked-out repository and in a distribution
# tarball. Usable in dependencies, particularly for files that don't
# want to depend on config.h but do want to track version changes.
# Delete this file prior to any autoconf run where you want to rebuild
# files to pick up a version string change; and leave it stale to
# minimize rebuild time after unrelated changes to configure sources.
#
# It is probably wise to add these two files to .gitignore, so that you
# don't accidentally commit either generated file.
#
# Use the following line in your configure.ac, so that $(VERSION) will
# automatically be up-to-date each time configure is run (and note that
# since configure.ac no longer includes a version string, Makefile rules
# should not depend on configure.ac for version updates).
#
# AC_INIT([GNU project],
# m4_esyscmd([build-aux/git-version-gen .tarball-version]),
# [bug-project@example])
#
# Then use the following lines in your Makefile.am, so that .version
# will be present for dependencies, and so that .tarball-version will
# exist in distribution tarballs.
#
# BUILT_SOURCES = $(top_srcdir)/.version
# $(top_srcdir)/.version:
# echo $(VERSION) > $@-t && mv $@-t $@
# dist-hook:
# echo $(VERSION) > $(distdir)/.tarball-version
case $# in
1) ;;
*) echo 1>&2 "Usage: $0 \$srcdir/.tarball-version"; exit 1;;
esac
tarball_version_file=$1
nl='
'
# First see if there is a tarball-only version file.
# then try "git describe", then default.
if test -f $tarball_version_file
then
v=`cat $tarball_version_file` || exit 1
case $v in
*$nl*) v= ;; # reject multi-line output
[0-9]*) ;;
*) v= ;;
esac
test -z "$v" \
&& echo "$0: WARNING: $tarball_version_file seems to be damaged" 1>&2
fi
if test -n "$v"
then
: # use $v
elif
v=`git describe --abbrev=4 --match='v*' HEAD 2>/dev/null \
|| git describe --abbrev=4 HEAD 2>/dev/null` \
&& case $v in
[0-9]*) ;;
v[0-9]*) ;;
*) (exit 1) ;;
esac
then
# Is this a new git that lists number of commits since the last
# tag or the previous older version that did not?
# Newer: v6.10-77-g0f8faeb
# Older: v6.10-g0f8faeb
case $v in
*-*-*) : git describe is okay three part flavor ;;
*-*)
: git describe is older two part flavor
# Recreate the number of commits and rewrite such that the
# result is the same as if we were using the newer version
# of git describe.
vtag=`echo "$v" | sed 's/-.*//'`
numcommits=`git rev-list "$vtag"..HEAD | wc -l`
v=`echo "$v" | sed "s/\(.*\)-\(.*\)/\1-$numcommits-\2/"`;
;;
esac
# Change the first '-' to a '.', so version-comparing tools work properly.
# Remove the "g" in git describe's output string, to save a byte.
v=`echo "$v" | sed 's/-/./;s/\(.*\)-g/\1-/'`;
else
v=UNKNOWN
fi
v=`echo "$v" |sed 's/^v//'`
# Don't declare a version "dirty" merely because a time stamp has changed.
git status > /dev/null 2>&1
dirty=`sh -c 'git diff-index --name-only HEAD' 2>/dev/null` || dirty=
case "$dirty" in
'') ;;
*) # Append the suffix only if there isn't one already.
case $v in
*-dirty) ;;
*) v="$v-dirty" ;;
esac ;;
esac
# Omit the trailing newline, so that m4_esyscmd can use the result directly.
echo "$v" | tr -d '\012'
# Local variables:
# eval: (add-hook 'write-file-hooks 'time-stamp)
# time-stamp-start: "scriptversion="
# time-stamp-format: "%:y-%02m-%02d.%02H"
# time-stamp-end: "$"
# End:

0
m4/.keep
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17
src/Makefile.am
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AUTOMAKE_OPTIONS = foreign
SUBDIRS = \
liboptions \
libdebug \
libsample \
libfilter \
libfm \
libdtmf \
libfsk \
libtimer \
libjitter \
libosmocc \
libph_socket \
libg711 \
pstn

28
src/pstn/Makefile.am
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AM_CPPFLAGS = -Wall -Wextra -g $(all_includes)
bin_PROGRAMS = \
osmo-cc-pstn-endpoint
osmo_cc_pstn_endpoint_SOURCES = \
tones.c \
callerid.c \
pstn.c \
main.c
osmo_cc_pstn_endpoint_LDADD = \
$(COMMON_LA) \
../libdebug/libdebug.a \
../liboptions/liboptions.a \
../libsample/libsample.a \
../libfilter/libfilter.a \
../libdtmf/libdtmf.a \
../libfsk/libfsk.a \
../libfm/libfm.a \
../libfilter/libfilter.a \
../libtimer/libtimer.a \
../libjitter/libjitter.a \
../libosmocc/libosmocc.a \
../libg711/libg711.a \
../libph_socket/libph_socket.a \
-lm

400
src/pstn/callerid.c
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/* caller ID transmission
*
* (C) 2022 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/>.
*/
/* see:
* ETSI EN 300 659-1
* ETSI EN 300 659-2
* ETSI EN 300 659-3
*/
#include <stdio.h>
#include <stdint.h>
#include <string.h>
#include <math.h>
#include <errno.h>
#include <time.h>
#include "../libsample/sample.h"
#include "../libdebug/debug.h"
#include "../libtimer/timer.h"
#include "../libosmocc/message.h"
#include "callerid.h"
#define db2level(db) pow(10, (double)(db) / 20.0)
/* Notes for dBV:
* See TR 101 182 for complex impedance, that is 1020 Ohms.
* This is close to 1mW.
*/
#define DBV_TO_DBM -0.086 /* impedance 1020 Ohms */
#define DTAS_TX_DBV -16.0 /* relative to 1 Volt RMS */
#define DTAS_DURATION 0.100 /* 100 ms */
#define FSK_TX_DBV -15.5 /* relative to 1 Volt RMS */
#define FSK_BAUD_RATE 1200
#define FSK_BIT_ADJUST 0.5 /* must be 0.5 to completely sync each bit */
#define DTMF_TONE_ON 0.070 /* 70 ms */
#define DTMF_TONE_OFF 0.070 /* 70 ms */
#define TONE_DTAS_1 2130.0
#define TONE_DTAS_2 2750.0
#define TONE_V23_F0 2100.0
#define TONE_V23_F1 1300.0
#define TONE_BELL_F0 2200.0
#define TONE_BELL_F1 1200.0
#define WAIT_RING_FSK 0.700 /* wait 500ms-2000ms after ring before sending FSK */
#define WAIT_CW_DTAS 0.050 /* wait 50ms after CW before sending DT_AS */
#define WAIT_DTAS_TEACK 0.210 /* wait 160ms + 50ms(latency) for TE-ACK after DT_AS */
#define WAIT_TEACK_FSK 0.055 /* wait 55ms after recognition of TE-ACK before sending FSK */
#define WAIT_RING_DTMF 0.500 /* wait after 1st ring before sending DTMF */
#define WAIT_FSK_END 0.200 /* wait after FSK until restoring line condition */
#define WAIT_DTMF_END 1.000 /* wait after FSK until restoring line condition */
/* provide bit to FSK modulator */
static int fsk_send_bit(void *inst)
{
callerid_t *cid = (callerid_t *)inst;
/* FSK transmission done */
if (cid->pos >= cid->len + 3)
return -1;
/* send 3 extra bit to make sure that CID passes all filers */
if (cid->pos >= cid->len) {
cid->pos++;
return 1;
}
/* channel seizure */
if (cid->seize)
return (cid->seize-- & 1);
/* mark */
if (cid->mark) {
cid->mark--;
return 1;
}
/* start bit */
if (cid->bpos == 0) {
cid->bpos++;
return 0;
}
/* stop bit */
if (cid->bpos > 8) {
cid->bpos = 0;
cid->pos++;
return 1;
}
/* data bit */
cid->bpos++;
return (cid->data[cid->pos] >> (cid->bpos - 2)) & 1;
}
/* init caller ID processor */
int callerid_init(callerid_t *cid, int samplerate, int bell, char dtmf)
{
double f0, f1;
int i;
int rc;
memset(cid, 0, sizeof(*cid));
cid->samplerate = samplerate;
cid->use_dtmf = dtmf;
for (i = 0; i < 65536; i++)
cid->dtas_sine[i] = sin((double)i / 65536.0 * 2.0 * M_PI) * db2level(DTAS_TX_DBV + DBV_TO_DBM);
if (!cid->use_dtmf) {
/* FSK */
if (bell) {
/* BELL 202 */
f0 = TONE_BELL_F0;
f1 = TONE_BELL_F1;
} else {
/* V.23 (used by Telekom) */
f0 = TONE_V23_F0;
f1 = TONE_V23_F1;
}
rc = fsk_mod_init(&cid->fsk, cid, fsk_send_bit, samplerate, FSK_BAUD_RATE, f0, f1, db2level(FSK_TX_DBV + DBV_TO_DBM), 0, 1);
if (rc < 0) {
PDEBUG(DDSP, DEBUG_ERROR, "FSK init failed!\n");
return rc;
}
} else {
/* DTMF or DT_AS */
/* because we render with 1 mW, we need to set level to 1.0 */
dtmf_encode_init(&cid->dtmf, samplerate, 1.0);
}
return 0;
}
/* exit caller ID processor */
void callerid_exit(callerid_t *cid)
{
if (!cid->use_dtmf)
fsk_mod_cleanup(&cid->fsk);
// no samplerate cleanup
// no DTMF cleanup
}
/* subroutine to add information element (TLV) */
static uint8_t *add_ie(uint8_t *p, uint8_t type, int len, const uint8_t *val)
{
*p++ = type;
*p++ = len;
memcpy(p, val, len);
return p + len;
}
/* set caller ID and start transmission */
int callerid_set(callerid_t *cid, int cw, int dt_as, const char *callerid, uint8_t caller_type, int use_date)
{
int clen = strlen(callerid);
if (clen > 32) {
PDEBUG(DDSP, DEBUG_ERROR, "Callerid too long!\n");
return -EINVAL;
}
if (!cid->use_dtmf) {
uint8_t *p;
uint8_t par = 0;
int i;
time_t time_sec;
struct tm *tm;
uint8_t data[8];
if (caller_type == OSMO_CC_PRESENT_RESTRICTED)
PDEBUG(DDSP, DEBUG_INFO, "Sending restricted caller ID reason.\n");
else if (caller_type == OSMO_CC_PRESENT_ALLOWED && callerid[0])
PDEBUG(DDSP, DEBUG_INFO, "Sending caller ID '%s' via FSK.\n", callerid);
else
PDEBUG(DDSP, DEBUG_INFO, "Sending unavailable caller ID reason.\n");
p = cid->data + 2;
if (use_date) {
/* add IE (data) */
time_sec = get_time();
tm = localtime(&time_sec);
data[0] = '0' + (tm->tm_mon + 1) / 10;
data[1] = '0' + (tm->tm_mon + 1) % 10;
data[2] = '0' + (tm->tm_mday) / 10;
data[3] = '0' + (tm->tm_mday) % 10;
data[4] = '0' + (tm->tm_hour) / 10;
data[5] = '0' + (tm->tm_hour) % 10;
data[6] = '0' + (tm->tm_min) / 10;
data[7] = '0' + (tm->tm_min) % 10;
p = add_ie(p, 0x01, 8, data);
}
if (caller_type == OSMO_CC_PRESENT_ALLOWED && callerid[0]) {
/* add IE (cid) */
p = add_ie(p, 0x02, strlen(callerid), (const uint8_t *)callerid);
} else {
/* add IE (unavailable reason) */
if (caller_type == OSMO_CC_PRESENT_RESTRICTED)
data[0] = 0x50; /* restricted */
else
data[0] = 0x4f; /* not available */
p = add_ie(p, 0x04, 1, data);
}
/* preceed type+length */
cid->len = p - cid->data - 2;
cid->data[0] = (cw) ? 0x82 : 0x80;
cid->data[1] = cid->len;
cid->len += 2;
/* append parity */
p = cid->data;
for(i = 0; i < cid->len; i++)
par += *p++;
par = (~par) + 1;
*p++ = par;
cid->len++;
cid->pos = 0;
cid->bpos = 0;
cid->seize = (cw) ? 0 : 300;
cid->mark = 180;
if (dt_as) {
cid->state = CID_STATE_WAIT_DTAS;
cid->wait = (int)(WAIT_CW_DTAS * (double)cid->samplerate);
PDEBUG(DDSP, DEBUG_DEBUG, "Start sending callerid '%s' via FSK, waiting to start DT-AS transmission.\n", callerid);
} else {
cid->state = CID_STATE_WAIT_FSK;
cid->wait = (int)(WAIT_RING_FSK * (double)cid->samplerate);
PDEBUG(DDSP, DEBUG_DEBUG, "Start sending callerid '%s' via FSK, waiting to start FSK transmission.\n", callerid);
}
} else {
if (caller_type == OSMO_CC_PRESENT_RESTRICTED) {
PDEBUG(DDSP, DEBUG_INFO, "Not sending restricted caller ID.\n");
return 0;
} else if (caller_type == OSMO_CC_PRESENT_ALLOWED && callerid[0]) {
PDEBUG(DDSP, DEBUG_INFO, "Sending caller ID '%s' via DTMF.\n", callerid);
} else {
PDEBUG(DDSP, DEBUG_INFO, "Not sending unavailable caller ID.\n");
return 0;
}
cid->data[0] = cid->use_dtmf;
memcpy(cid->data, callerid, clen);
cid->data[clen + 1] = 'C';
cid->pos = 0;
cid->wait = (int)(WAIT_RING_DTMF * (double)cid->samplerate);
cid->state = CID_STATE_WAIT_DTMF;
PDEBUG(DDSP, DEBUG_DEBUG, "Start sending callerid '%s' via DTMF, waiting to start DTMF transmission.\n", callerid);
}
return 0;
}
/* TE-ACK received, digit 'D' shall be recognised */
void callerid_te_ack(callerid_t *cid, char digit)
{
if (cid->state != CID_STATE_WAIT_TE_ACK)
return;
if (digit < 'A' || digit > 'D') {
PDEBUG(DDSP, DEBUG_DEBUG, "Ignoring digit '%c', this is not a valid TE-ACK signal.\n", digit);
return;
}
PDEBUG(DDSP, DEBUG_DEBUG, "Received valid TE-ACK digit '%c', wait to send FSK transmission.\n", digit);
/* wait for FSK */
cid->state = CID_STATE_WAIT_FSK;
cid->wait = (int)(WAIT_TEACK_FSK * (double)cid->samplerate);
}
/* send audio chunk.
* if return value is less than given length, the transmission is complete.
*/
int callerid_send(callerid_t *cid, sample_t *samples, int length)
{
int count = 0, ret;
int i;
again:
switch (cid->state) {
case CID_STATE_NULL:
break;
case CID_STATE_WAIT_DTAS:
case CID_STATE_WAIT_DTMF:
case CID_STATE_WAIT_FSK:
case CID_STATE_WAIT_TE_ACK:
case CID_STATE_WAIT_END:
if (length <= cid->wait) {
memset(samples, 0, sizeof(*samples) * length);
count += length;
cid->wait -= length;
break;
}
memset(samples, 0, sizeof(*samples) * cid->wait);
count += cid->wait;
samples += cid->wait;
length -= cid->wait;
cid->wait = 0;
switch (cid->state) {
case CID_STATE_WAIT_DTAS:
cid->state = CID_STATE_SEND_DTAS;
cid->dtas_phaseshift65536[0] = TONE_DTAS_1 / (double)cid->samplerate * 65536.0;
cid->dtas_phaseshift65536[1] = TONE_DTAS_2 / (double)cid->samplerate * 65536.0;
cid->dtas_phase65536[0] = 0.0;
cid->dtas_phase65536[1] = 0.0;
cid->dt_as_count = (int)(DTAS_DURATION * (double)cid->samplerate);
PDEBUG(DDSP, DEBUG_DEBUG, "Now start DT_AS transmission.\n");
break;
case CID_STATE_WAIT_DTMF:
cid->state = CID_STATE_SEND_DTMF;
PDEBUG(DDSP, DEBUG_DEBUG, "Now start DTMF transmission.\n");
dtmf_encode_set_tone(&cid->dtmf, cid->data[cid->pos++], DTMF_TONE_ON, DTMF_TONE_OFF);
break;
case CID_STATE_WAIT_FSK:
cid->state = CID_STATE_SEND_FSK;
PDEBUG(DDSP, DEBUG_DEBUG, "Now start FSK transmission.\n");
break;
case CID_STATE_WAIT_TE_ACK:
PDEBUG(DDSP, DEBUG_INFO, "No TE-ACK received. Phone does not seem to support off-hook caller ID.\n");
cid->state = CID_STATE_NULL;
break;
case CID_STATE_WAIT_END:
PDEBUG(DDSP, DEBUG_DEBUG, "Reestablish audio.\n");
cid->state = CID_STATE_NULL;
break;
default:
; /* should never happen */
}
if (cid->state == CID_STATE_NULL)
break;
goto again;
case CID_STATE_SEND_DTAS:
for (i = 0; i < length; i++) {
if (cid->dt_as_count == 0)
break;
cid->dt_as_count--;
*samples++ = cid->dtas_sine[(uint16_t)cid->dtas_phase65536[0]] + cid->dtas_sine[(uint16_t)cid->dtas_phase65536[1]];
cid->dtas_phase65536[0] += cid->dtas_phaseshift65536[0];
if (cid->dtas_phase65536[0] >= 65536.0)
cid->dtas_phase65536[0] -= 65536.0;
cid->dtas_phase65536[1] += cid->dtas_phaseshift65536[1];
if (cid->dtas_phase65536[1] >= 65536.0)
cid->dtas_phase65536[1] -= 65536.0;
}
length -= i;
count += i;
if (cid->dt_as_count == 0) {
/* wait for TE ACK */
cid->state = CID_STATE_WAIT_TE_ACK;
cid->wait = (int)(WAIT_DTAS_TEACK * (double)cid->samplerate);
goto again;
}
break;
case CID_STATE_SEND_DTMF:
ret = dtmf_encode(&cid->dtmf, samples, length);
count += ret;
samples += ret;
length -= ret;
if (!length)
break;
if (!cid->data[cid->pos]) {
PDEBUG(DDSP, DEBUG_DEBUG, "DTMF transmission done, waiting to re-establish audio.\n");
cid->wait = (int)(WAIT_DTMF_END * (double)cid->samplerate);
cid->state = CID_STATE_WAIT_END;
break;
}
dtmf_encode_set_tone(&cid->dtmf, cid->data[cid->pos++], DTMF_TONE_ON, DTMF_TONE_OFF);
goto again;
case CID_STATE_SEND_FSK:
ret = fsk_mod_send(&cid->fsk, samples, length, 0);
count += ret;
samples += ret;
length -= ret;
if (length) {
PDEBUG(DDSP, DEBUG_DEBUG, "FSK transmission done, waiting to re-establish audio.\n");
cid->wait = (int)(WAIT_FSK_END * (double)cid->samplerate);
cid->state = CID_STATE_WAIT_END;
break;
}
break;
}
return count;
}

47
src/pstn/callerid.h
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#include "../libfsk/fsk.h"
#include "../libdtmf/dtmf_encode.h"
enum cid_state {
CID_STATE_NULL = 0,
CID_STATE_WAIT_DTAS,
CID_STATE_SEND_DTAS,
CID_STATE_WAIT_TE_ACK,
CID_STATE_WAIT_FSK,
CID_STATE_SEND_FSK,
CID_STATE_WAIT_DTMF,
CID_STATE_SEND_DTMF,
CID_STATE_WAIT_END,
};
typedef struct callerid {
/* settings */
int samplerate; /* sample rate to render output */
char use_dtmf; /* if set, use DTMF instead of FSK, start digit given */
/* play states */
enum cid_state state; /* current action to perform */
int wait; /* time to send silence until next tone is sent */
/* frame */
uint8_t data[1024]; /* buffer to hold frame data to be sent */
int len; /* bytes in buffer */
int pos; /* byte in buffer to play next */
int bpos; /* bit to play next, in case of FSK */
int seize, mark; /* bit counters for seizure and mark signal */
/* tone generation */
double dtas_sine[65536]; /* sine wave for both DT_AS frequencies at correct level */
double dtas_phaseshift65536[2]; /* frequency of DT_AS */
double dtas_phase65536[2]; /* current phase of DT_AS */
int dt_as_count; /* count samples of DT_AS */
fsk_mod_t fsk; /* modulator for FSK */
dtmf_enc_t dtmf; /* modulator for DTMF */
} callerid_t;
int callerid_init(callerid_t *cid, int samplerate, int bell, char dtmf);
void callerid_exit(callerid_t *cid);
int callerid_set(callerid_t *cid, int cw, int dt_as, const char *callerid, uint8_t caller_type, int use_date);
void callerid_te_ack(callerid_t *cid, char digit);
int callerid_send(callerid_t *cid, sample_t *samples, int length);

413
src/pstn/main.c
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/* osmo-cc-pstn-endpoint main
*
* (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/>.
*/
#include <stdio.h>
#include <unistd.h>
#include <errno.h>
#include <signal.h>
#include <string.h>
#include <stdint.h>
#include <stdlib.h>
#include <termios.h>
#include <sched.h>
#include "../libdebug/debug.h"
#include "../liboptions/options.h"
#include "../libg711/g711.h"
#include "pstn.h"
pstn_t *pstn_ep = NULL;
int num_kanal = 1;
#define SUBSCRIBER_MAX 16
static char law = 'a';
static int serving_location = 1; /* private network serving local user */
static const char *socketname = NULL;
static const char *name = "pstn";
static const char *subscribers[SUBSCRIBER_MAX] = { "" };
static int subscriber_num = 0;
static int tx_delay = 0;
static int clip = 0;
static int cid_bell = 0;
static int cid_dtmf = 0;
static int cid_date = 0;
static int enblock = 4;
static int recall = 0;
static int ringing_types_incoming[SUBSCRIBER_MAX] = { 0 };
static int ringing_type_incoming_num = 0;
static int ringing_type_hold = 1;
static enum tones_type tones_type = TONES_TYPE_GERMAN;
static int rt_prio = 1;
#define MAX_CC_ARGS 1024
static int cc_argc = 0;
static const char *cc_argv[MAX_CC_ARGS];
static void print_usage(const char *app)
{
printf("Usage: %s -s <socketname> [<options>]\n", app);
}
static void print_help()
{
/* - - */
printf(" -h --help\n");
printf(" This help\n");
printf(" --config [~/]<path to config file>\n");
printf(" Give a config file to use. If it starts with '~/', path is at home dir.\n");
printf(" Each line in config file is one option, '-' or '--' must not be given!\n");
debug_print_help();
printf(" -s --socket <path>\n");
printf(" Path to UNIX socket that provides layer 1 connection to an PSTN device\n");
printf(" -n --name <interface name>\n");
printf(" Give name of this interface. It will be sent in each call towards\n");
printf(" -I --subscriber <subscriber id>\n");
printf(" What caller ID to send on calls made from terminal. (default = '%s')\n", subscribers[0]);
printf(" -I <subscriber id 1> -R <ringing type 1> -I <subscriber id 2> -R <ringing type 2> ...\n");
printf(" You may specify multiple subscriber IDs and as much ringing types.\n");
printf(" Calls to a subscriber's ID will then ring as specified. Calls to an\n");
printf(" unspecified subscriber ID will ring as specified for first subscriber.\n");
printf(" --tx-delay <ms>\n");
printf(" Give a delay in milliseconds. This is required for modem/fax. Audio\n");
printf(" toward ISDN interface is buffered with the given delay.\n");
printf(" This feature alters dejittering strategy.\n");
printf(" --clip [--cid-date]\n");
printf(" Enable caller ID, optionally with date info. (disabled by default)\n");
printf(" --cid-bell\n");
printf(" Use Bell 202 to modulate caller ID, rather than V.23 (default).\n");
printf(" Note that both systems are so similar (and have equal center frequency),\n");
printf(" so that it does not matter which one is used. (my oppinion!)\n");
printf(" --cid-dtmf D\n");
printf(" Use DTMF with given start digit 'D' for default, rather than FSK.\n");
printf(" 'D' is used in Taiwan, 'A' in Brazil...\n");
printf(" --cid-date\n");
printf(" Send date+time with caller ID. (May cause errors on some phones.)\n");
printf(" --enblock off | <seconds>\n");
printf(" Enable en-block dialing, to collect number before setup. The value\n");
printf(" given is the number of seconds to wait for more digits to be dialed.\n");
printf(" (default = %d)\n", enblock);
printf(" --recall\n");
printf(" Enable recall / call waiting. (disabled by default)\n");
printf(" -R --ringing-type-incoming <type>\n");
printf(" Cadenced ringing for incoming call. (default = %d)\n", ringing_types_incoming[0]);
printf(" --ringing-type-hold <type>\n");
printf(" Cadenced ringing for call on hold. (default = %d)\n", ringing_type_hold);
printf(" -T --local-tones german | oldgerman | american\n");
printf(" Send locally generated tones, if not provided by remote interface.\n");
printf(" DTMF may not work with old German tones, because they might interfer!\n");
printf(" --ulaw\n");
printf(" Use U-LAW for b-channel coding instead of alaw.\n");
printf(" --serving-location (see Q.931)\n");
printf(" 0 = user, 1 = private network serving local user (default=%d)\n", serving_location);
printf(" -r --realtime <prio>\n");
printf(" Set prio: 0 to disable, 99 for maximum (default = %d)\n", rt_prio);
printf(" -C --cc \"<osmo-cc arg>\" [--cc ...]\n");
printf(" Pass arguments to Osmo-CC endpoint. Use '-cc help' for description.\n");
}
static void print_recall()
{
/* - - */
printf("\n");
printf("Recall:\n");
printf("To enable recall, use --recall option. Then you can place or receive a second\n");
printf("call and switch between them.\n");
printf("If you have an active call, press hook-flash to hold the active call and make\n");
printf("a second call.\n");
printf("If you have two connected calls, press hook-flash to switch between these\n");
printf("calls.\n");
printf("If an incoming call is waiting, you will hear CW singal. Press hook-flash to\n");
printf("switch between these calls.\n");
printf("If you want to release the active call and retrieve the call on hold, hang up\n");
printf("and the phone will ring. Answer it.\n");
printf("\n");
}
#define OPT_TX_DELAY 256
#define OPT_TX_CLIP 257
#define OPT_TX_CID_BELL 258
#define OPT_TX_CID_DTMF 259
#define OPT_TX_CID_DATE 260
#define OPT_TX_ENBLOCK 261
#define OPT_TX_RECALL 262
#define OPT_TX_RING_I 'R'
#define OPT_TX_RING_H 264
#define OPT_ULAW 265
#define OPT_SERVING 266
static void add_options(void)
{
option_add('h', "help", 0);
option_add('v', "verbose", 1);