[SIPForum-discussion] SIP trunking. Use of payload type 13, 97 and 98

[Maulik Shah (maushah)]

Payload type 13 was reserved for CN (comfort noise)
http://www.networksorcery.com/enp/protocol/rtp.htm

However payload types 96 to 127 are for dynamic use, not reserved so you
should in theory be able to use those. However the NGN maybe using these
PTs for something else in their network which though in violation of an
RFC is practically done commonly. I guess if you want to interwork this
NGN, you may have to play by their rules unfortunately unless you can
convince them to change.

Thanks
Maulik


SBSBU Product Marketing
Cisco Systems
408 525 7827
Small Business Support Community 

-----Original Message-----
From: discussion-bounces at sipforum.org
[mailto:discussion-bounces at sipforum.org] On Behalf Of juanof at vtr.net
Sent: Tuesday, July 28, 2009 4:17 PM
To: discussion at sipforum.org
Subject: Re: [SIPForum-discussion] SIP trunking. Use of payload type
13,97 and 98

I'm attaching a wireshark file for your reference, with a GW call, where
you 
can see "incompatible destination"... according to NGN, because we are
using 
payload type 97 in media description...

Anybody understands this???... Please any help is useful.

BR.

On Thu, 23 Jul 2009 19:54:45 -0400
  <juanof at vtr.net> wrote:
> Hi to all,
>             Please if anybody could help me to understand, what could
be the 
> reason for restriction of use of payload types 13, 97 and 98 in SIP
message 
> body, media description.
> 
> I'm trying to make GW calls through SIP trunk, but NGN demands to me,
not to 
> use these payload types. Any idea to require this?.
> 
> Thanks in advance for any help.
>  
> Best regards,
> 
> Juan Ordenes.
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