Subject: Re: Symmetric versus asymmetric codec negotiation

From: Christian Groves <[email-masked]>
Date: Fri, 12 Jan 2001 16:46:57 +1100

G'Day Dan,

You are correct H248 doesn't preclude asymmetric codecs and I don't
think this is a problem. If the MGC wants to limit this it could send an
overloaded list for local and remote with codec pairs in the same list
position.

ie.
List position     Local     Remote
1                 G711      G711
2                 GSM EFR   GSM EFR
3                 G711      GSM EFR
4                 GSM EFR   G711

Position 1 and 2 (symmetric) would be tried before the asymmetric
configuration.

Cheers, Christian

Dan Linton wrote:
>
> The codec negotiation process for Megaco does not seem to preclude
> the terminating MG from selecting asymmetric codecs even though
> the originating MG may not support that functionality. Is this a
> problem or did I misinterpret the specification?