[Asterisk-Users] Advantage of IAX2 to SIP?

[Steve Underwood]

WipeOut wrote:

> Michael Vogel wrote:
>
>> Hi!
>>
>> Some - few - providers are using IAX2 as a protocol. Most are using 
>> SIP. I know that there are advantages of IAX2 regarding multiple 
>> connections. But beside this I'm asking myself (and you all) why I 
>> should prefer IAX2 when my SIP connection is working.
>>
>> Are there differences in the performance?
>>
>> Bye!
>>
>> Michael
>
>
> Hi,
>
> If your SIP setup is working and you are happy with it then thats 
> cool.. If it aint broke don't fix it..
>
> The advantages of IAX are as you said, you can make multiple calls at 
> the same time but also that NAT isn't an issue and AFAIK it doesn't 
> have as much of an overhead as SIP..

SIP has very little overhead. Its the RTP you use in conjunction with 
SIP that has the huge overhead. Same with H.323, which uses exactly the 
same RTP for the actual communication.

Steve