[Standards] Jingle audio and G.711

Peter Saint-Andre stpeter at stpeter.im
Fri Apr 11 12:50:22 UTC 2008


Paul Witty wrote:
> Peter Saint-Andre wrote:
>> Lauri Kaila wrote:
>>  
>>> 2008/4/10, Peter Saint-Andre <stpeter at stpeter.im>:
>>>    
>>>> Offlist, someone mentioned to me that it might be appropriate for
>>>>  XEP-0167 to recommend or even require support for the ITU-T's G.711
>>>>  technology, which is represented by payload-types 0 (PCMU) and 8
>>>> (PCMA)
>>>>  as registered with the IANA.
>>>>  http://www.itu.int/rec/T-REC-G.711/e
>>>>
>>>>  Thoughts?
>>>>
>>>>       
>>> I think 64 kbits/s is too much to be mandatory.
>>>     
>>
>> I think the idea was that G.711 is supported everywhere, so recommending
>> support for it in Jingle would help interoperability with existing SIP
>> networks and the PSTN.
>>   
> Indeed.  We have a Jingle->SIP/H.323 gateway.  I don't know of any SIP
> or H.323 endpoints which support Speex, so if that is the only
> recommended codec for Jingle audio, then we have to be prepared to
> transcode the audio in all cases.  By guaranteeing a minimum of G.711,
> we should be always able to gateway between protocols without
> transcoding if so desired, even if we may need to transcode for higher
> quality audio e.g. Speex to AAC.

Right, that's the idea.

Is basic G.711 still patent-encumbered in any way? I'll have to do some
research on that...

Peter

-- 
Peter Saint-Andre
https://stpeter.im/

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