[asterisk-users] Different codecs for reading and writing

[Elliot Murdock]

Hello,

Thank you...do you know if IAX can do this?

The reason for doing is this is to get over the adsl upload/download
discrepancy.  While G711 gives terrific quality, it is not always that
feasible for the upload direction, which has much more limited
bandwidth.  Accordingly, it would be possible to use G729 for upload,
but keep the higher quality codec, G711, for download.

Thanks,
Elliot

On Sat, Aug 1, 2009 at 11:06 PM, Alex Balashov<abalashov at evaristesys.com> wrote:
> Elliot Murdock wrote:
>
>> I am wondering how to configure Asterisk and devices so I can use
>> different codecs for upstream and downstream packets.
>
> You can't. With SIP as the channel technology, at least, the SDP
> negotiation model demands a uniform codec from both sides.
>
> I guess there's nothing to stop two endpoints that both have multi-codec
> capabilities from using different codecs for send and receive in
> *principle*, but it would fall outside the standard implementational
> behaviour of SIP endpoints.
>
> --
> Alex Balashov
> Evariste Systems
> Web    : http://www.evaristesys.com/
> Tel    : (+1) (678) 954-0670
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> Mobile : (+1) (678) 237-1775
>
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