[Asterisk-Users] IAX Codec

[Dana Olson]

I've called using G729 SIP phones over my LAN, and I think it sounds
quite good. YMMV.


On Fri, 04 Mar 2005 15:58:23 -0500, Martin Roy <mroy at mac.com> wrote:
> I have 2 Asterisk servers connected with IAX. It's working fine I can
> call an extension from one phone in an office to another phone in the
> other office. The only problem I have is lagging. What codec should I
> use? I have Cisco phones 7960 on both end. Currently in the IAX trunk I
> configured it to disallow all and use GSM only. In my sip config of each
> phone I use disallow all and allow ulaw and alaw only.
> 
> I see that the Cisco phone support G.729a, G.711u and G.711a codecs.
> 
> I know that Digium is selling G.729 codec on there website. Should I get
> that to fix my problem?
> 
> The less bandwitdh the codec takes over the Internet the better chance I
> have that it will work fine I presume.
> 
> The maximum upload speed I can reach is 64k/sec so 512kbits. But that's
> if there's nothing else using the internet. I see that G.729 use 8kbps
> per call which seems quite small. The sound quality is good enough for
> SIP to SIP phones over the Net?
> 
> Thanks
> 
> Martin
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