[Asterisk-Users] Re: RE : codecs order and so on

[Olivier Taylor]

Well, another try

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

For the Uas, they are sets to have g729 first
Calls to/from pstn needs g729
Calls to/from zap needs Ulaw

ALL incoming calls works OK even if the caller is G729(I have made a caller
using g729 only)...

Calling zap => no problem, Ulaw is choosen
Calling pstn provider =>fail (I need g729 but Ulaw is choosen)
Call from zap => no problem Ulaw is choosen
Call from pstn => no problem g729 used...

What does it mean?
Strange isn't it?

In fact Asterisk let the Uas negociates the codec for incoming calls and
doesn't care for outgoing calls.
In a context for incoming, no problems
In a context for outgoing(I use goto context,extension,priority)Asterisk
doesn't take care of the context codecs priority.

It's then false to say that asterisk uses the prefered codec of Uas, I have
here a Ua wich uses differents codecs for incoming calls.
Question is : Why Asterisk doesn't care of codecs in an outgoing context?

Any good idea is welcome.

Ps: the solution is to have a g729 codec form Digium, ok, I have it and it
works, but it takes a lot of cpu (50% of my Soekris box).














-----Message d'origine-----
De : asterisk-users-bounces at lists.digium.com
[mailto:asterisk-users-bounces at lists.digium.com] De la part de Tomislav
Parcina
Envoyé : mercredi 11 janvier 2006 12:28
À : asterisk-users at lists.digium.com
Objet : [Asterisk-Users] Re: RE : codecs order and so on


In article <005101c61687$b878d340$6402a8c0 at olivierg>, 
olivier.taylor at gmail.com says...
> 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.

Phones usualy use only one prefered codec. So, if your phone supports 
ulaw and g729, it will use only one of those two to communicate with *. 

Once the phone is authenticated with * he allways use the same codec. So 
you have to get use that on that side is that specific codec. What is on 
another side (SIP, Zap, IAX2...) and what codec other side uses, 
determinates do you need codec translation in * box. If you need codec 
translation then you need to have licence (for g729).

I hope I have make it clear for you.

Solution:
Count do you get more outside ulaw or g729 calls (at the same time). If 
you get more ulaw calls then use ulaw codec on SIP phones. Buy the same 
number of g729 licences as you need simultanius phone calls to that 
provider.


-- 

Tomislav Parcina
name.surname at email.t-com.hr

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