This can be done.
First you will want to extract the RTP port numbers that pjsip has negotiated.
pj::MediaTransportInfo transInfo = getMedTransportInfo(0);
transInfo.localRtpName will contain the local port
pj::StreamInfo streamInfo = getStreamInfo(0);
streamInfo.remoteRtpAddress will contain the remote port
Then you have to disconnect the media.
pj::CallInfo ci = getInfo();
pjsua_call *call = &pjsua_var.calls[ci.id];
// Iterate all the call medias
for (mi = 0; mi < call->med_cnt; ++mi) {
pj_status_t status=PJ_SUCCESS;
pjsua_call_media *call_med = &call->media[mi];
// disconnect media so RTP block can use it
if (call_med->tp_st > PJSUA_MED_TP_IDLE) {
pjsua_set_media_tp_state(call_med, PJSUA_MED_TP_IDLE);
pjmedia_transport_media_stop(call_med->tp);
}
pjsua_set_media_tp_state(call_med, PJSUA_MED_TP_NULL);
status = pjmedia_transport_close(call_med->tp);
call->med_cnt=0;
call->med_prov_cnt=0;
if (status!=PJ_SUCCESS){
//display error
}
}
call->med_prov_cnt = 0;
Finally, you can use the RTP ports in your application.
-----Original Message-----
From: Sai Mukund Sagar Deshpande via pjsip <pjsip@xxxxxxxxxxxxxxx>
Sent: Wednesday, May 26, 2021 10:16 AM
To: pjsip@xxxxxxxxxxxxxxx
Cc: Sai Mukund Sagar Deshpande <saimukunds@xxxxxxxxxxxxxxxxx>
Subject: Only use SIP signalling and disable pjmedia RTP
Hi,
I have an application (SLIC/DSP software) on our embedded device (has POTS ports) that handles RTP incoming and outgoing traffic once RTP dest IP/port and local RTP port are provided.
I want to extract RTP src/dest port information from SIP messages and pass on to this application during call creation, so that it can manage RTP streams.
Till now, I am able to establish SIP calls on our device but audio is not working as pjsip opens RTP socket which I want to open on my RTP application.
# netstat -anp | grep 400
udp 0 0
0.0.0.0:4000 0.0.0.0:* 1571/pjsua-
mips-unk
udp 0 0
0.0.0.0:4001 0.0.0.0:* 1571/pjsua-
mips-unk
udp 0 6400
Is it possible to do this easily? i.e., to use pjsip only for SIP signalling and disable RTP socket creation in pjmedia.
Regards,
SMS
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