[Standards] Jingle audio and G.711

Olivier Crête olivier.crete at collabora.co.uk
Fri Apr 11 13:52:42 UTC 2008


On Fri, 2008-04-11 at 06:50 -0600, Peter Saint-Andre wrote:
> 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...

The G.711 standard was published in 1972, I don't know of any
jurisdiction where patents can last that long.

-- 
Olivier Crête
olivier.crete at collabora.co.uk
Collabora Ltd
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