[Asterisk-Users] codecs order and so on

[Olivier Taylor]

Just have a lok at this config :

[general]
Disallow=all
Allow=g729
Allow=ulaw

[pstn]
Disallow=all
Allow=g729

[zap]
Disallow=all
Allow=ulaw

In extensions.conf, I change the context for each call, Asterisk doesn't
care of codecs in contexts, it uses the order of general...
Could be good to have Ssterisk making a match between codecs in General and
the context used to make a call
But definitiely, Asterisk choose g729 even if I am in the zap context

Any idea, help is welcome.

Olivier








-----Message d'origine-----
De : asterisk-users-bounces at lists.digium.com
[mailto:asterisk-users-bounces at lists.digium.com] De la part de Moises Silva
Envoyé : mardi 10 janvier 2006 22:51
À : Asterisk Users Mailing List - Non-Commercial Discussion
Objet : Re: [Asterisk-Users] codecs order and so on


Doing in the console "show translation" i can see that it seems not be
possible to translate from any to g729 codec, or from g729 to any. So, let
me try to find a reason for this.

 When you have first allow=g729  (preferred codec)
all the calls to pstn providers work because the phones and asterisk agree
to use g729, so no codec translation is done. all the calls to and from fxo
fails because no translation can be made from ULAW to g729, and from g729
(phones) to ulaw. then asterisk is not smart enough to realize that can ask
the phones to use ulaw (i assume the phones support ulaw) to not use
translation to call the fxo???

 When you have first allow=ulaw (prefered codec)
all the calls to and from fxo works because the prefered codec is ulaw, then
from fxo to phones using ulaw, no codec translation is made all the calls to
pstn providers fails, again, because it seems asterisk gives preference to
ulaw codec (the first list codec) so, the phones use ulaw, and is not
possible to translate ulaw to g729 and viceversa??

im interested in knowing the reason too, any guidelines?

regards

On 1/10/06, Olivier Taylor <olivier.taylor at gmail.com> wrote:
>
> The problem :
>
> an asterisk box with 2 fxo
>
> First fxo just receive calls from pstn (ulaw)
> Second fxo receive and send call to mobile network thru a sipbox(ulaw) 
> Calls to pstn are sent to a pstn provider accepting only g729 Internal 
> calls doesn't care of codecs All Uas have g729 (g729 is then pass-thru 
> when needed) All Uas have ulaw(of course)
> If I have in [general]
> disallow=all
> allow=g729
> allow=ulaw
>
> In this case:
>
> all calls to pstn providers works
> all calls to and from fxo fails because of : No translator path exists 
> for ....
>
> If I have in [general]
> disallow= all
> allow= ulaw
> allow= g729
>
> In this case:
>
> all calls to and from fxo works
> all calls to pstn providers fails because of : No translator path 
> exists for .... _______________________________________________
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