[asterisk-users] Zap Codec

[Eric Wieling]

If you are talking between two g729 endpoints, the Asterisk overhead is 
very small.

Jeremy Mann wrote:
> So in other words, if I have G729 enabled on the phones, I must get G729 licenses to use Zap channels.  Otherwise I have to use ULAW for everything?
> 
> I fail to understand why it'd be difficult to do codec negotiation on SIP-ZAP calls, Zap sends that it only supports ulaw, if the phone doesn't then the call is cancelled or forwarded to logic to translate.
> 
> I realize G729 is fairly cheap, but it's useless server overhead when the phone supports the codec it needs natively.
> 
> Is there any dialplan logic that can coerce the transaction to be ulaw only?  Setting something in the SIP header perhaps?
> -----Original Message-----
> From: asterisk-users-bounces at lists.digium.com [mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of Eric Wieling
> Sent: Tuesday, April 15, 2008 8:05 AM
> To: Asterisk Users Mailing List - Non-Commercial Discussion
> Subject: Re: [asterisk-users] Zap Codec
> 
> The PSTN only allows ulaw or alaw (depending on your location).  You
> CANNOT send calls in any other codec over a PSTN line.  Generally, if
> you want to use G729 then you must buy a G729 license (with a few
> exceptions).
> 
> Jeremy Mann wrote:
>> But I want my polycom to attempt g729 on SIPPEER-SIPPEER calls, I only
>> want ulaw used when SIPPEER-ZAP is the case.
>>
>>
>>
>> *From:* asterisk-users-bounces at lists.digium.com
>> [mailto:asterisk-users-bounces at lists.digium.com] *On Behalf Of *Darryl
>> Dunkin
>> *Sent:* Monday, April 14, 2008 9:01 PM
>> *To:* Asterisk Users Mailing List - Non-Commercial Discussion
>> *Subject:* Re: [asterisk-users] Zap Codec
>>
>>
>>
>> This is SIP channel you need to limit. Forcing ulaw only, the Polycom
>> will fall back to ulaw.
>>
>>
>>
>> Per peer, in your sip.conf:
>>
>> disallow=all
>> allow=ulaw
>>
>>
>>
>> ------------------------------------------------------------------------
>>
>> *From:* asterisk-users-bounces at lists.digium.com
>> [mailto:asterisk-users-bounces at lists.digium.com] *On Behalf Of *Jeremy Mann
>> *Sent:* Monday, April 14, 2008 14:39
>> *To:* Asterisk Users Mailing List - Non-Commercial Discussion
>> *Subject:* [asterisk-users] Zap Codec
>>
>> Is there a way to force Zap channels to only use ulaw, and not even
>> attempt g729 negotiation?
>>
>>
>>
>> My polycom 550 has G729,ulaw as priority, the Zap always fails b/c I'm
>> not licensed for the codec on the asterisk box.
>>
>>
>>
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> 
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Consulting for Asterisk, Polycom, Sangoma, Digium, Cisco, LAN, WAN, QoS, 
T-1, PRI, Frame Relay, Linux, and network design.  Based near 
Birmingham, AL.  Now accepting clients worldwide.