[asterisk-users] SIP v IAX2

[Henry.L.Coleman]

As I understand it the main advantege IAX has over SIP is the number of
port it uses and therefore its ability to traverse router/switches and
firewalls
Also the higher number of simulatanious SIP calls travelling through these
devices adds a higher overhead than IAX with it's single port.
Personally I like IAX but I there simply isnt enough hardware out there to
use it exclusively.

Henry L.Coleman CEO
*VoIP-PBX* 1-866-415-5355
Toronto Ontario
Canada


>> -----Original Message-----
>> From: Dave Cotton [mailto:dcotton at linuxautrement.com]
>> Sent: Thursday, October 26, 2006 10:21 AM
>> To: Asterisk Users Mailing List - Non-Commercial Discussion
>> Subject: Re: [asterisk-users] SIP v IAX2
>>
>>
>> On Thu, 2006-10-26 at 17:43 +0200, Pavel Jezek wrote:
>> > with SIP qualify, I can specify, what time in delay I will accept,
>> > with sip and setting qualify=3000 I can circumvent this
>> anoying messages
>> > (bacause delay in reply is about 2000ms, and I accept 3000ms)
>> > with iax, qualify is working different, so setting
>> qualify=3000 will
>> > "ping" peer every 3s,
>> > quite inconsistent, imho
>>
>> So are you saying that in your world two different things, created by
>> totally different people, must have the same configuration settings.
>
> - You will find DUNDi configuration a lot easier with IAX, although you
> can use SIP.
> - If you use SIP to route calls between Asterisk boxes, you will lose your
> caller id as SIP uses the From: number to authenitcate with. You will have
> to store the original caller id in an extra SIP header, and then pluck it
> out an the other end, if you want to preserve caller id. Yuck. IAX doesn't
> have this problem.
>
> Doug.
>
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