[SIPForum-discussion] Codec selection with SIP

[Donald Lee]

Acctually it depends on the UAS's behavior, it prefer to select the codec as
remoter first or local first. In this case, if A as the UAC and B as the
UAS. in remote first case, B will select 711, otherwise it will select 729.

And for my experience, the SIP device should have this ability to change it
prefer select method according to various conditions.


On 6/3/08, Eric Burger <eburger at sipforum.org> wrote:
>
> Often the codec selection by the UAS, not in priority of UAC, is UAS policy
> enforcement.
>
> On Jun 2, 2008, at 9:27 PM, Yuantao Zhang wrote:
>
>
>> I think Raj is right. For my experience, UAS respects itself more than
>> UAC. UAS will choose one codec according to its own priority. But is there
>> any standard for this? Or just most software engineers prefer this?
>>
>>
>> -----Original Message-----
>> From: Raj Jain [mailto:rj2807 at gmail.com]
>> Sent: 2008年5月31日 2:36
>> To: José Antonio García Flores
>> Cc: discussion at sipforum.org
>> Subject: Re: [SIPForum-discussion] Codec selection with SIP
>>
>> You've not shown an SDP offer/answer exchange. But, assuming that A is
>> the offerer and presents g711, g729 (in that order) and that B is the
>> answerer (that would prefer to have the call setup on g729), then
>> it'll put g729 *only* in its answer. That way, the agreed upon codec
>> for the session will be g729.
>>
>> --
>> Raj Jain
>>
>> On Fri, May 30, 2008 at 9:00 AM, José Antonio García Flores
>> <joseantonio.garcia at corp.ya.com> wrote:
>>
>>> Hi,
>>> We want to know how codec is selected in SIP calls, i mean , if A party
>>> has
>>> priority over B party.
>>> For example:
>>> A party:
>>>  codec 1 = g711
>>>  codec 2 = g729
>>> B party:
>>>  codec 1 = g729
>>>  codec 2= g711
>>>
>>> At the end, which codec is selected? -> g711?
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>>
>>
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>
>
>
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-- 
BR
Donald
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