[asterisk-users] g729a compatibility

[Elliot Murdock]

Hello Phillip!

Thank you.

However, do you what Asterisk does if there is no rtpmap that
describes the format profile in the media description?

The SIP packets states:

audio 25184 RTP/AVP 18 98 96 97 101 13

However, there is no rtpmap for format 18.  Asterisk does not seem to
be associating 18 with the G729 codec, since the calls fails at
pickup.

Thank you,
Elliot

On Thu, Jul 2, 2009 at 11:15 AM, Philipp
Kempgen<philipp.kempgen at amooma.de> wrote:
> Elliot Murdock schrieb:
>> Thank you for that piece of information.  Which RFC does it state that
>> the audio name is "G729"?
>
> http://tools.ietf.org/html/rfc3555#section-4.1.9
>
>> On Thu, Jul 2, 2009 at 12:16 AM, Kevin P. Fleming<kpfleming at digium.com> wrote:
>>> Elliot Murdock wrote:
>>>> I have a sip device that is sending in the SDP:
>>>>
>>>> rtpmap:98 g729a
>>>>
>>>> It does not seem like Asterisk is negotiating the codec properly,
>>>> because while the call rings, the rtp lines fail.  However, on other
>>>> sip devices that have "rtpmap:18 g729" in their SDP, things work fine
>>>> with Digium's commercial g729 license.
>>>>
>>>> How do I get "98 g729a" recognized by Asterisk?
>>>
>>> You don't. That's not a standards-compliant way of reporting G.729A in
>>> SDP. The RFC says it should be 'G729', but Asterisk also accepts 'G.729'
>>> and 'G729A'. It does not accept any lowercase form of the codec name.
>
> http://tools.ietf.org/html/rfc3555#section-3
> ---cut---
>   Note that the payload format (encoding) names defined in the RTP
>   Profile are commonly shown in upper case.  MIME subtypes are commonly
>   shown in lower case.  These names are case-insensitive in both
>   places.
> ---cut---
>
> Sounds like it should really be case-insensitive but I might easily
> be mistaken. Didn't dig too deep into RTP/SDP specifications.
>
>
>    Philipp Kempgen
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