Hello,
I don't know the answer to your question, but why are you answering 200
OK with only one codec? You have the problem of updating the UAS script
every time you change codec in phone because of that.
Why don't you program several codecs in UAS, so anytime you change in
phone is to one of the already supported codecs? it will not be an
"unlimited number of payload types", but at least a bigger set.
Best regards,
Luis
in On 11/12/2017 10:21 PM, Andreas Byström (Polystar) wrote:
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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Luis Rojas
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Sixbell Nekotec Solutions
Los Leones 1200
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Santiago, Chile
Phone: (+56-2) 22001288
mailto:luis.ro...@sixbell.com
http://www.sixbell.com
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