[SIPForum-discussion] Question About media attribute within SDP

[Venkata Ramesh B]

Hello Rashid Shakil,

1.      1.  What “a=rtpmap:19 *CN*/8000” represent in this SDP
 The CN's static payload type is 13. Check if you can configure the CISCO
box to use 13 for CN. I guess that the SIP peer will accept it.

2.       2. How can it be removed

Yo  You may have to check the CISCO box.

3.       3. Is it possible that it cause fax failures ?

It     It is possible. But, it depends on the implementation. Some
implementation may ignore this CN and proceed with the call. Some
implementation may decide to release the call.
Best Regards,
Ramesh.

On Fri, Jul 24, 2009 at 10:21 PM, Shakil, Rashid <rshakil at covad.com> wrote:

>  Hello All,
>
>
>
> For outbound calls the customer’s Cisco IAD 2431 generating following SDP.
> The SIP peer doesn’t like the media parameter “a=rtpmap:19 *CN*/8000” in
> following SDP.  Two quick questions,
>
>
>
> 1.       What “a=rtpmap:19 *CN*/8000” represent in this SDP
>
> 2.       How can it be removed
>
> 3.       Is it possible that it cause fax failures ?
>
>
>
>
>
> v=0
>
> o=- 2847654225 2847654225 IN IP4 72.245.184.130
>
> s=SIP Call
>
> c=IN IP4 67.102.244.5
>
> t=0 0
>
> m=audio 17746 RTP/AVP 0 101 19
>
> c=IN IP4 67.102.244.5
>
> a=rtpmap:0 PCMU/8000
>
> a=rtpmap:101 telephone-event/8000
>
> a=fmtp:101 0-16
>
> *a=rtpmap:19 CN/8000*
>
> a=ptime:20
>
>
>
> Thanks in advance for the input
>
>
>
> Regards,
>
>
>
> Rashid Shakil
>
>
>
>
>
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