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: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] 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:* [EMAIL PROTECTED] >> [mailto:[EMAIL PROTECTED] *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:* [EMAIL PROTECTED] >> [mailto:[EMAIL PROTECTED] *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. >> >> >> >> ------------------------------------------------------------------------ >> >> This e-mail, facsimile, or letter and any files or attachments >> transmitted with it contains information that is confidential and >> privileged. 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