[asterisk-users] Re: Dynamic Codec Selection

[Wildheart]

Hi,

   The PSTN connection is via a zaptel card, rather than a sip peer.

    With thanks,

     Tim

>>> On 2006-10-24 06:44:01 -0700, "Wildheart"
>>> <asterisk-users at php-systems.com> said:
>>>
>>>> Hi,
>>>>
>>>> Does anyone know a what to use a different codec for calls which a
>> re
>>>> handset to handset (eg, G711) then when we have calls to the out side
>>>> world (via an asterisk server) to use a different codec(eg, G729)?
>>>> <snip>
>
>>> I responded:
>>> yes, this is simple,  just make it so the extensions allow both g729
>>> and ulaw, and set your "outside world" is g729.
> On 2006-10-25 03:31:39 -0700, "Wildheart"
> <asterisk-users at php-systems.com> said:
>
>> Hi Marty,
>>
>>    By the outside world, I mean the PSTN connection. I am still
>> intereste d
>> in how you would set this up. Can you paste in a sample config?
>
> One internal phone from SIP.conf:
>
> ;
> ; SIP entry for users test rig
> [2004]
> type=friend
> secret=footest
> dtmfmode=inband  ; my stupid PSTN gateway doesn't like rfc2833
> auth=md5
> host=dynamic
> nat=yes
> canreinvite=no
> disallow=all
> allow=ulaw
> allow=g729
> context=autocontext
> callerid="Alton Wireless Phone "<2004>
>
> Another "internal" extension
>
> ; IAX entry for user karma
> [3000]
> type=friend
> secret=testfoo
> auth=md5
> host=dynamic
> disallow=all
> allow=ulaw
> allow=g729
> context=karma
> callerid="Karma"<2065555500>
>
> Ok, now these two extensions when one calls the other should use uLaw.
>
> Now here is my extension for my PSTN gateway:
>
>
> ;
> ; SIP entry for user (FXO)
> [2003]
> type=friend
> secret=testPSTN
> dtmfmode=inband
> auth=md5
> host=dynamic
> nat=yes
> canreinvite=no
> disallow=all
> allow=g729
> context=autocontext
> callerid="Alton Qwest Line"<2065551183>
>
> Depending how your PSTN is setup the last bit could be quite different,
> but the premise is the same.  Since the PSTN only allows g729, this
> will force other connections to that also.  Of course you need to be
> sure your devices support this, or else you will need to buy licenses
> for G729 to transcode, which is also a significant hit for CPU.
>
> Further more, this only makes sense to do if your "PSTN" calls are
> being terminated by someone OFF your local network.  If your PSTN calls
> (like mine) are being routed to a local gateway, then using ulaw should
> be ok also (it's your network, make it work!).
>
>
> Marty
>
>
>
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