Music On Hold (Moh) - Siemens HiPath optiPoint 410 S Setup Manual

c01.fm

Music on Hold (MOH)

Execution of Call Pickup
8 Music on Hold (MOH)
The RFC 3261 offers several options for indicating " On Hold". In case of an optiPoint tele-
phone, a method "INACTIVE" is added to the session description if the other party is put on
hold. Asterisk, however, only recognizes "SENDONLY".
There is a workaround to make sure that Asterisk plays the MOH (Music on Hold) in spite of
that. You have to modify the file chan_sip.c which by default is stored in the folder /usr/src/as-
terisk/channels.
In line 3552 the RTP MAP is assigned.
This is the original source code:
sdpLineNum_iterator_init(&iterator);
while ((a = get_sdp_iterate(&iterator, req, "a"))[0] != '\0') {
char* mimeSubtype = ast_strdupa(a); /* ensures we have enough
space */
if (!strcasecmp(a, "sendonly")) {
sendonly=1;
continue;
}
if (!strcasecmp(a, "sendrecv")) {
sendonly=0;
}
if (sscanf(a, "rtpmap: %u %[^/]/", &codec, mimeSubtype) != 2)
continue;
if (debug)
ast_verbose("Found description format %s\n",
mimeSubtype);
/* Note: should really look at the 'freq' and '#chans' params
too */
ast_rtp_set_rtpmap_type(p->rtp, codec, "audio",
mimeSubtype);
if (p->vrtp)
ast_rtp_set_rtpmap_type(p->vrtp, codec, "video",
mimeSubtype);
}
For evaluating the INACTIVE of the optiPoint telephones, the If loop has to be adjusted in a cer-
tain way so that the INACTIVE is interpreted as SENDONLY.
24
optiPoint 410/420 - Using with Asterisk, Configuration Guide
30. June 2006