[Freeswitch-users] m=audio 5016 RTP/AVP 96 3 107 110 0 8 101., what does it mean?

[Steven Ayre]

Dynamic codecs are indicated by the a=rtpmap lines. Those lines may the
number used on m=audio to the description of the codec.

All static payload types *may* be overriden to another codec using a=rtpmap
lines, but usually aren't. If they're not overridden, they use the values
on the page you already found.

Note a=rtpmap lines are optional for static payload types. That does cause
problems on SIP clients that failed to read that part of the standard, so
for those set verbose_sdp=true on the channel. That then means your SDP is
larger and may give problems where packets are too large and get
fragmented, which SIP/UDP doesn't handle very well.

-Steve


On 23 June 2013 04:23, Nathan Neulinger <nneul at mst.edu> wrote:

> I think this may be what you're looking for...
>
> http://www.iana.org/assignments/rtp-parameters/rtp-parameters.xml
>
> 96+ are dynamic apparently
>
> 0, 8 pcmu and pcma
> 3 is gsm
>
> At least according to that list... I don't know enough about the protocol
> to know how the dynamic ones are assigned.
>
> This that's odd though is that the list on that page is in decimal, with
> comfort noise at 13. That would make sense if
> it were in hex (19), so maybe I'm misinterpreting.
>
> -- Nathan
>
> On 06/22/2013 10:02 PM, Sayyed Mohammad Emami Razavi wrote:
> > m=audio 5016 RTP/AVP 96 3 107 110 0 8 101.
> > Is there any digits represents sip codecs in subject?!
> >
> > Can any body describe this statement?!
> >
> > For example in response to one of my questions, Steven told me:
> > "Your phone is not offering any codecs in the INVITE:
> > m=audio 15696 RTP/AVP 19
> > The only payload type listed is 19 (comfort noise) - there are no codecs
> listed."
> > base on my logs: http://pastebin.freeswitch.org/21084
>
> --
> ------------------------------------------------------------
> Nathan Neulinger                       nneul at mst.edu
> Missouri S&T Information Technology    (573) 612-1412
> System Administrator - Architect
>
> _________________________________________________________________________
> Professional FreeSWITCH Consulting Services:
> consulting at freeswitch.org
> http://www.freeswitchsolutions.com
>
> 
> 
>
> Official FreeSWITCH Sites
> http://www.freeswitch.org
> http://wiki.freeswitch.org
> http://www.cluecon.com
>
> FreeSWITCH-users mailing list
> FreeSWITCH-users at lists.freeswitch.org
> http://lists.freeswitch.org/mailman/listinfo/freeswitch-users
> UNSUBSCRIBE:http://lists.freeswitch.org/mailman/options/freeswitch-users
> http://www.freeswitch.org
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.freeswitch.org/pipermail/freeswitch-users/attachments/20130623/1313dbbd/attachment.html