On Fri, 2008-04-11 at 08:37 -0600, Peter Saint-Andre wrote: > Olivier Crête wrote: > > 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 <[EMAIL PROTECTED]>: > >>>>> > >>>>>> 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. > > I don't either. :) A quick search didn't yield any patents outstanding, > so I think it's probably safe (IANAL etc.). Now the question is whether > it should be mandatory to implement or just recomended.
Making it mandatory will be a problem in any low-bandwidth environment (its still 64kpbs.., compared to 6.4kbps for G.729). -- Olivier Crête [EMAIL PROTECTED] Collabora Ltd
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