[asterisk-users] SIP v IAX2

[Henry.L.Coleman]

I suspect that IAX has less overhead but when we get into voice bandwidth
then the answer gets very complex for any given codec. Andrew mentions SIP
concurrency but I doubt that this "buys" very much. In reality, in a
single processor world everything gets processes serially.
For *2* IAX would be my choice every time, but for IP phones 95% are SIP
so it's academic as to which protocol is best (as you have no choice). The
only way I see of changing this is to manufacture IPphones with both
protocols in firmware but that would only be possible if the demand for
IAX devices increased.
Its a bit like the VHS vs Beta war, both systems have their good and bad
points In the end, sales/marketing perception will always win regardless
of better technologies.


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


> On Thu, 2006-10-26 at 13:14 -0400, Henry.L.Coleman wrote:
>> 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.
>>
>
> What about the bandwidth used for both protocols? Is IAX using less or
> more bandwidth than SIP?
>
>
>
>> 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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