From: [EMAIL PROTECTED]
I just ran some tests with various brands of phones and none send
ptime in their SDP, which makes this harder to understand. Here is
one from a polycom. Are you saying that even though 3 media formats
are listed, they are represented as one media stream? Is there an
example of one that includes multiple media streams you can point
me to.
RFC 4317, "Session Description Protocol (SDP) Offer/Answer Examples",
section 2.1:
v=0
o=alice 2890844526 2890844526 IN IP4 host.atlanta.example.com
s=
c=IN IP4 host.atlanta.example.com
t=0 0
m=audio 49170 RTP/AVP 0 8 97
a=rtpmap:0 PCMU/8000
a=rtpmap:8 PCMA/8000
a=rtpmap:97 iLBC/8000
m=video 51372 RTP/AVP 31 32
a=rtpmap:31 H261/90000
a=rtpmap:32 MPV/90000
This contains specifications for two media streams, because there are
two "m" lines.
I guess I am now thoroughly confused. When my SIP gateway
sends g729a10 and g729a20 to a snom, the call fails because only
ptime 10 is listed and the phone is only configured to receive
g729a20.
That makes sense.
But, as I mentioned, my SIP GW wants to talk 10 or 20. However, if
I make a call to the SIP GW, it connects at 729a20. Does this make
any sense at all?
You say "if I make a call to the SIP GW", but you do not specify what
UA is making the call, nor what SDP it is sending.
Session Description Protocol
Session Description Protocol Version (v): 0
Owner/Creator, Session Id (o): - 1172011391 1172011391 IN IP4
10.153.90.9
Owner Username: -
Could you please quote SDP as SDP rather than the extremely verbose
Ethereal expansion of SDP?
Dale
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