[asterisk-users] ITSP's no longer supporting IAX?

[OCG Technical Support]

I use simple port forwarding on an Linux firewall (iptables)...so that's not
the issue.

I was referring to IAX2 of course (IAX has be gone a long time I think)...
Unlimitel is running * 1.4.x (and so am I)...

I just can't understand IAX2 connections suddenly dropping (on one day)
being protocol issues (if no one changed their * versions).  Or is this how
IAX2 fails?

-----Original Message-----
From: asterisk-users-bounces at lists.digium.com
[mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of Dr. Michael J.
Chudobiak
Sent: March 25, 2009 9:29 AM
To: Asterisk Users List
Subject: Re: [asterisk-users] ITSP's no longer supporting IAX?

>> The choice of router/NAT is critical though. Unlimitel recommended the
>> SnapGear 560 to me, and it eliminated all the issues I was having with
>> IAX going through my Sonicwall devices.
>>
>> Just another datapoint for you...
> Just curious.
> 
> Since IAX only uses ONE port, do you have any idea what the technical
> reason behind a specific router would be critical?

Well, with a Sonicwall TZ170, you had to enabled "Firewall > VOIP > 
Enable consistent NAT", which was not the default setting.

Then, you had to figure out that "Firewall > Advanced > Default UDP 
Connection Timeout" defaulted to 30 seconds, less than the normal 
Asterisk 60 second registration timeout.

Then, for some reason, the TZ170 would simply lose packets. A fraction 
of calls would end almost immediately after they started, with Asterisk 
reporting a "raw hangup" error and INVAL packets, suggesting that some 
IAX2 packets were being lost, mis-ordered, or mis-translated.

Anyway, the Sonicwall TZ170 was totally unreliable for IAX2 connections. 
They caused me a lot of grief. Avoid them like the plague.

The Snapgear 560 "just works", which I appreciate very much!


- Mike

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