[Users] SIP vz IAX...

[Kristian Kielhofner]

Max Gregorian wrote:
> As they all said above.
>  
> I think IAX is supported on some Cisco equipment for WAN connectivity, 
> making it useful for interconnecting back-end systems and servers (e.g. 
> server to server rather than server to UA).
>  
> I believe IAX uses the same port(s) for signalling as for media, as 
> compared to SIP vs RTP using separate streams. This makes it easier when 
> doing port-forwarding and may give it an advantage for NAT traversal.
>  
> That being said, it is not yet an officially recognised protocol (from 
> what I heard) and has not yet been as widely adopted as SIP. In short, 
> you will find more SIP-enabled devices than you will find IAX devices, 
> though there are some IAX softphones around.
> 

IAX is definitely not supported by Cisco.  Perhaps you were thinking of 
some other protocol?

You are correct, IAX uses the same ports for signaling and media.

--
Kristian Kielhofner