Hi
Has someone ever created a UAS script that respond with the same codec(s) as
the incoming INVITE SDP offer?
The scripts I have used I usually create the 200 OK using something like this:
<!-- Send 200 OK on UPDATE -->
<send>
<![CDATA[
SIP/2.0 200 OK
[last_Via:]
[last_From:]
[last_To:]
[last_Call-ID:]
[last_CSeq:]
Contact: <sip:test@[local_ip]:[local_port];transport=[transport] >
Content-Type: application/sdp
Content-Length: [len]
v=0 0
o=ccs-0-275-2 02722940331338705 331338705 IN IP[local_ip_type] [local_ip]
s=-
c=IN IP[media_ip_type] [media_ip]
t=0 0
m=audio [media_port] RTP/AVP 8
a=ptime:20
But the above SDP in the 200 OK assumes that the incoming INVITE has an SDP
with g711alaw/PCMA (payloadtype=8) as offered codec. If the incoming call had
for example AMR, the call will fail if UAS responds with above.
Everytime I change codec in phone that places the call to this UAS, I need to
manually update the UAS script with the correct payload type and sometimes with
a=rtpmap / fmtp lines
My question is if there is a way to have the UAS use the same as the incoming
SDP? The script needs their own [media_port] so it cannot copy the m= line
fully. It needs to copy only the characters after RTP/AVP from that line. Also,
it need to copy all lines that starts with a=rtpmap or a=fmtp since they can
have information about the codec choosen. I'm happy if there is a way to
support one codec option (i.e one payloadtype after RTP/AVP and possible one
rtpmap and/or one fmtp line), and its even better if it can support an
unlimited number of payload types and rtpmap/fmtp
So, does anyone have that kind of UAS and are willing to share?
Regards,
// Andreas
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