[asterisk-users] Choose IAX or SIP trunking?

[Steve Edwards]

> Steve Edwards wrote:

>> Some say the audio quality is better with SIP. My experience has been 
>> with "low volume" (xx) calls across the internet and "high volume" 
>> (xxx) within the same cabinet.

On Wed, 30 Sep 2009, Kirill 'Big K' Katsnelson wrote:

> My understanding was that IAX encapsulates the same RTP traffic, or, and 
> the very least, same stream of data encoded by a codec. Is that not true 
> in case of IAX? How can a transport protocol affect volume--or quality 
> (lest it is dropping packets)?

My (limited) understanding is that IAX sends all call control and RTP to 
port 4569. Thus, a busy pipe can adversely affect timing if the single 
thread reading from the socket can't process the packets fast enough.

Whether this manifests itself as dropped packets or jitter or whatever is 
beyond my experience. I've never had a client complain, but most of my 
traffic is within the same cabinet.

-- 
Thanks in advance,
-------------------------------------------------------------------------
Steve Edwards       sedwards at sedwards.com      Voice: +1-760-468-3867 PST
Newline                                              Fax: +1-760-731-3000