[SIPForum-discussion] enforcing a variable policy on codecchoice

[Andrew Yu]

Hi Gordon,

If you mean that the call has to be translated from 711 to 729, it's a 
functionality of the sbc, not many sbcs support media translation. by 
far i know nextone can do this. the sbc must have a built in media 
server to do this.

Andrew

Beith, Gordon wrote:
> I'm not sure I agree with your answer, Andrew.
> I think Bill was trying to describe a scenario where an endpoint is
> using G.711 in the local or access network, but when a call passes from
> the local to the WAN environment, e.g. through a border controller, it
> would then switch over to G.729.
> Or did I miss his point entirely? :-)
> /Gordon
>
> -----Original Message-----
> From: discussion-bounces at sipforum.org
> [mailto:discussion-bounces at sipforum.org] On Behalf Of Andrew Yu
> Sent: Tuesday, June 12, 2007 1:17 AM
> To: bill at flanagan-consulting.com
> Cc: discussion at sipforum.org
> Subject: Re: [SIPForum-discussion] enforcing a variable policy on
> codecchoice
>
> Hi William,
>
> Codec selection depends on the endpoint where it is internally 
> configured with its codec priority, if you require the endpoint to 
> select 711 internally but 729 over the WAN, this is a feature that the 
> endpoint will have to support. SIP & SDP RFCs does not enforce any 
> policy on the choice of media codec. I hope this helps. Thanks.
>
> Andrew
>
> William Flanagan wrote:
>   
>> Hi,
>>
>> In reading the SIP and SDP RFCs, I see no obvious mechanism to enforce
>>     
>
>   
>> a policy on the choice of voice codec (for compression ratio or 
>> bandwidth usage) that would vary by called party.  For example, one 
>> might prefer G.711 locally, but require G.729 over the WAN.  Does any 
>> one know of such a deployment?
>>
>> Thanks,
>> Bill
>>
>> -- 
>> Flanagan Consulting 	 
>>
>>
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>> "Beware of false knowledge; it is more dangerous than ignorance."
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