[asterisk-users] Which internet phone protocol best to choose

[Alex Balashov]

The OP asked, if I recall, about the protocol which is likely to be 
supported rather universally by softphones and a wide variety of clients.

That is not a feature of IAX.

Tilghman Lesher wrote:

> On Friday 12 September 2008 18:31:23 Alex Balashov wrote:
>> The short answer is SIP.
>>
>> Stefan Gofferje wrote:
>>> http://www.voip-info.org/wiki-IAX
>>> http://www.voip-info.org/wiki-IAX+versus+SIP
>>> http://www.voip-info.org/wiki/view/Asterisk+IAX+clients
> 
> The longer and more accurate answer is that it depends on what you're doing
> and what your goals are.  If you need to be able to pierce firewalls and
> handle NAT easily, especially in areas where a government-controlled telephone
> monopoly might be hostile to VoIP, then IAX2 is for you.
> 
> If, on the other hand, interoperability and choice of phones are what you
> need, then SIP is pretty much a no-brainer.
> 
> Of course, nothing prevents you from using SIP for phones and IAX2 for
> backbone, either.  Notably missing to this discussion are the MGCP and H.323
> protocols, which probably aren't much use to you, unless you need to connect
> to certain VoIP providers who haven't yet upgraded their equipment to the 21st
> century.
> 


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Alex Balashov
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