[SIPForum-discussion] RFC 3407 SDP Payload

[Abhishek Mishra]

Hi Ken,

I see a problem here. As per RFC 3407, Section 3:

"The first capability description MUST, however, follow
   immediately after the sequence number."

In the enclosed SDP, however, the sequence number is
coming after the capability description which in incorrect.

Also, two "a=cpar" lines with "a=ptime" doesn't makes any sense to me.

Kind Regards,
-Abhishek

On Tue, 2007-08-07 at 08:09, Ken Ryon wrote:
> Can anyone of you find a problem with the following SDP payload from a
> Nortel CS2000?
> 
> How I read RFC3407, the rtpmap media attribute is not required and my
> client (if it is RFC3407 compliant) should be matching up on 0 and 8. 
> PCMU and PCMA codecs.
> 
> Any thoughts?
> 
> v=0
> o=PVG 0 871293894 IN IP4 10.1.1.10
> s=-
> p=+1 6135555555 
> c=IN IP4 10.1.1.10
> t=0 0
> a=cdsc: 1 audio RTP/AVP 0 8 116 18 13 101
> a=cpar: a=rtpmap:116 AAL2-G726-32/8000
> a=cpar: a=rtpmap:101 telephone-event/8000
> a=cpar: a=fmtp:101 0-15
> a=cpar: a=ptime:10
> a=cpar: a=ptime:20
> a=cpar: a=fmtp:18 annexb=yes
> a=sqn: 0
> m=audio 61862 RTP/AVP 0 8 101
> a=fmtp:101 0-15
> a=ptime:20
> a=rtpmap:101 telephone-event/8000
> 
>  Cheers,
> -Ken
> 
> 
> 
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