[asterisk-users] Teliax problems, they say use SIP, more mature & better working than IAX

[Steve Totaro]

Scott Plante wrote:
> We have a Teliax IAX trunk that we use as an overflow for our four 
> regular business lines into our local Asterisk PBX (Trixbox). We have 
> our Teliax account set up so that it goes to a Teliax voicemail box if 
> it cannot reach our Asterisk server, and we have the channel set up 
> for 5 simultaneous connections. Occasionally, calls are sent to the 
> Teliax voicemail box for no apparent reason. In this case, we get this 
> message in our local Asterisk log:
>
> DEBUG[3129] chan_iax2.c: Raw Hangup 07.174.202.3:4569,src=0, dst=214
>
> I've done tests on the weekend where I'm calling with one and two 
> phones continually. Once the local asterisk box picks up, I hang up. 
> There is no other traffic at the time. One time I did 75 calls in 
> about 25 minutes, and 9 of them failed this way and went to voicemail. 
> Another time, 88 calls went through fine, then 4 went straight to 
> voicemail. Most of the time I was dialing from two phones 
> simultaneously. In no case did one of the two calls go through while 
> the other failed. However it was usually only seconds after a 
> successful call, and seconds after calls would go through successfully 
> again. During this period I was connected to the Asterisk box from a 
> remote location (where I was placing the calls to the Teliax number), 
> so I don't think the entire IP connection was going out. I was the 
> only one placing any calls in or out of the Asterisk box during these 
> tests.
>
> The Teliax support person (note the IAX in the name) wrote: "You may 
> want to try changing to SIP as it is a more mature protocol and seems 
> to work better in general." Is it the general experience on the list 
> that SIP is more mature and reliable than IAX? We like the fact that 
> we don't have to open inbound ranges of ports for IAX to work. We are 
> in Atlanta and we're connecting to a Teliax POP in Colorado. They've 
> been talking about opening an Atlanta POP since at least April of last 
> year. Do you think a provider with a closer point of presence would 
> not have this problem so much? Considering the fact that we do see a 
> message in the logs, and that we are able to keep up other IP streams, 
> would you agree the problem is not our general IP connectivity? Any 
> idea what in general causes the "Raw Hangup" message appearing in our 
> logs and is it likely to be on our end, their end, or either?
> Scott
>

I have come to the same conclusion about IAX a long time ago.

 I only use it when there is some sort of double NAT situation, where 
SIP absolutely will not work.  It really means something when TelIAX and 
ALSO IAX.CC both recommend using SIP.

Thanks,
Steve