[SIPForum-techwg] Can we please have at least one real codec

[Hadriel Kaplan]

Well, unless you can somehow magically make the UAS support a codec it doesn't support, I don't see the decision as being solely the UAC's.  ;)

Don't get me wrong - the ideal scenario would be that the best codec for a call is the one used, where "best" codec is best user experience (for any cost incurred), not best MOS score per the ITU for a point-to-point wire.  I have no idea how any interconnect spec can know what the best such codec is for all call scenarios possible.  Nor do I know how any interconnect spec can police, enforce, monitor, or require what goes on beyond its interconnection scope.  For example, how do you know whether everyone you call just happens to only support G.711 or not?

But I don't think there's much to get worried about here, fwiw; I've never seen a provider strip codecs for anything but beneficial reasons.  Whether it's to make calls actually succeed where they would otherwise have failed, or to consume less bandwidth on access uplinks, or to reduce costs, etc.  They generally don't just want to screw with you. :)

-hadriel
p.s. and I'm not defending G.711 either, BTW.  But we gotta have at least one common denominator to interop (transcoding costs money).


> -----Original Message-----
> From: techwg-bounces at sipforum.org [mailto:techwg-bounces at sipforum.org] On
> Behalf Of Roni Even
> Sent: Friday, February 13, 2009 12:52 AM
> To: 'Cullen Jennings'; 'Jack Burton'
> Cc: 'SIPForum-TechWG'
> Subject: Re: [SIPForum-techwg] Can we please have at least one real codec
>
> Like Dan I think that one advantage of IP phones is that they can use
> higher
> quality codecs, 7 or 14 Khz. If you leave one codec as Mandatory the
> question will be what about the media line transparency. Is the decision
> about which codecs are supported is left only to the SIP PBX / SP to
> decide
> or can SIP phone used decide which one they would like to have.
>
> Regards
> Roni Even
>
> -----Original Message-----
> From: techwg-bounces at sipforum.org [mailto:techwg-bounces at sipforum.org] On
> Behalf Of Cullen Jennings
> Sent: Thursday, February 12, 2009 11:06 PM
> To: Jack Burton
> Cc: SIPForum-TechWG
> Subject: Re: [SIPForum-techwg] Can we please have at least one real codec
>
>
> Great - let the customer choose
>
> On Feb 12, 2009, at 11:05 AM, Jack Burton wrote:
>
> > Bandwidth per call is getting cheaper all the time.
> >
> > I think mandating a codec that makes VOIP calls sound inferior to
> > TDM calls will bring at least as much ridicule as one using more
> > bandwidth.
> >
> > If we mandate any codec at all, we should only require G.711.   G.
> > 711 is the only codec that is supported in virtually every endpoint/
> > gateway and is royalty-free.
> >
> > -Jack
> >
> > >>> Cullen Jennings <fluffy at cisco.com> 2/12/2009 01:28 >>>
> >
> > Bandwidth for call is expensive - we want a T1 VoIP line to support
> > more calls, not less calls that a T1 PRI line. I think we have to
> > require codec that uses less bandwidth than 711 or the whole thing
> > will just be made fun of by the marketing departments of PSTN
> > providers. I'm not saying people have to use this codec, but I think
> > it has to be implemented on both sides.
> >
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