[kwlug-disc] Asterisk: SIP vs IAX

L.D. Paniak ldpaniak at fourpisolutions.com
Fri Feb 4 09:34:15 EST 2011

SIP is almost always the best answer.  IAX is technically better, but I
find it often has glitches with maintaining registration.  It is
designed mainly as an Inter-Asterisk eXchange for joining servers
together, not for client-end equipment (though it has some advantages
for that too when (eg.) your ISP is not SIP-friendly).

www.voip.ms has Mexican numbers with servers in Toronto for $8.50/month.
This might be a better option for you.

If you have Asterisk at home, why don't you have your Mexican
number/trunk terminate there and then you can route calls as you wish-
even put in an IVR: "Press one for Raul, press two for grandson A ..."
Putting Mexican calls over Unlimitel will double your per-minute

Your Android should be able to connect to your home server if it has a
public IP.  Dyndns will help you to identify it if the IP is not static.
I also run a dyndns client on my Android so that the server can
whitelist traffic from the phone.  Ideally, when I get VPN running on my
phone, I hope to put VoIP and other traffic in the tunnel.  Not sure if
performance will be acceptable in that configuration.

On Thu, 2011-02-03 at 21:23 -0800, Raul Suarez wrote:
> So, here I am, ready to take the plunge. About to embark in my own Asterisk adventure.
> I say "about" instead of "ready" because after reading I think I'm just left with one question.
> When I was about to order from Unlimitel, they ask "SIP or IAX?"
> When I installed and tested Asterisk using extensions I saw several samples for IAX and I even successfully connected to ekiga.net through SIP.
> All I've read is about SIP, but when I googled SIP vs. IAX it seems that IAX is a native Asterisk protocol with many advantages for someone like me but a few disadvantages. http://www.voip-info.org/wiki/view/IAX+versus+SIP
> Most of the help I found is about SIP.
> To "complicate" the matters, Unlimitel does not offer Virtual # in Mexico, so I'm planning to go with Unlimitel for my local line and with http://www.mydivert.com. ($12 CAD) for a local Mexican number.
> They say that "Can I peer my DID number to an IAX address
> Yes. We can send calls using SIP or IAX protocol."
> Now, I don't know which one to choose. IAX seems like a better option for me, but I don't know if the disadvantages can tip the scale in favour of SIP.
> Here are my simple requirements
> 1 asterisk server inside my home network (10 Mbps)
> 1 ATA connected to a wireless phone to be the default inbound extension.
> 3 or 4 Android phones with a VoIP app (Currently working well with SIP)
> I want to be able to allow the phones to connect to the PBX even when they are outside the network (e.g. when they are in the university network) and make phone calls through my local line.
> The "mydivert" phone will be peered directly to Unlimitel according to their FAQ so I don't need to configure it on my side. (although I guess I could)
> "Geographical DID numbers purchased at MyDivert.com can also be used with your own SIP provider. Simply update your phone number SIP settings from your MyDivert user account. 
> All incoming calls will then ring to your chosen SIP without diversion."
> So the question is very simple SIP or IAX? 
> And if I choose one over the other, is that definitive or can I change it later?
> Raul Suarez
> Technology consultant
> Software, Hardware and Practices
> _________________
> Twitter: rarsamx
> http://rarsa.blogspot.com/ 
> An eclectic collection of random thoughts
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