Found how to fix this problem.
It totally removes video media (m=video 0 RTP/AVP 97 96 ...) from SDP, if
we answer without video.
Patch:
File: sdp_neg.c
/* Create complete answer for remote's offer. */
static pj_status_t create_answer( pj_pool_t *pool,
pj_bool_t prefer_remote_codec_order,
const pjmedia_sdp_session *initial,
const pjmedia_sdp_session *offer,
pjmedia_sdp_session **p_answer)
{
..............................
/* Add the media answer */
- answer->media[answer->media_count++] = am;
+ if (am->desc.port != 0)
+ answer->media[answer->media_count++] = am;
2012/5/30 Dmitry (MicroSIP) <info at microsip.org.ua>
> My SIP provider rewrites SDP (answer on video call without video).
>
> Original lines:
>
> m=video 0 RTP/AVP 97 96
> c=IN IP4 212.53.40.76
> b=TIAS:256000
>
> Modified:
>
> m=video 23124 RTP/AVP 97 96
> c=IN IP4 212.53.40.76
> b=TIAS:256000
> a=inactive
>
> PJSIP terminates call after receiving modified SDP.
>
> Is modified SDP conforms to SIP standard? Is this problem of SIP server or
> PJSIP?
> Thank you.
>
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