asterisk users - Jan 2007 - Timeout in IAX vs SIP

When Asterisk dials an IAX destination with no registration, it very quickly 
comes to the conclusion that it can't make the call
    -- Executing [500@default:2] Dial("Zap/1-1", 
"IAX2/guest@misery.digium.com/s@default") in new stack
    -- Called guest@misery.digium.com/s@default
[Jan 29 21:43:15] NOTICE[1957]: chan_iax2.c:2686 __auto_congest: 
Auto-congesting call due to slow response
    -- IAX2/216.207.245.8:4569-1 is circuit-busy
    -- Hungup 'IAX2/216.207.245.8:4569-1'
  == Everyone is busy/congested at this time (1:0/1/0)
But if Asterisk Dials a SIP destination it doesn't have a registration, it 
waits for a very long time before giving up.

What is the difference?  Does IAX use TCP instead of UDP?  Is there some way 
to change timeout value in SIP attempt so it gives up in a reasonable time?

Yuan Liu

30 jan 2007 kl. 06.38 skrev Yuan LIU:
> When Asterisk dials an IAX destination with no registration, it  
> very quickly comes to the conclusion that it can't make the call
>    -- Executing [500@default:2] Dial("Zap/1-1", "IAX2/ 
> guest@misery.digium.com/s@default") in new stack
>    -- Called guest@misery.digium.com/s@default
> [Jan 29 21:43:15] NOTICE[1957]: chan_iax2.c:2686 __auto_congest:  
> Auto-congesting call due to slow response
>    -- IAX2/216.207.245.8:4569-1 is circuit-busy
>    -- Hungup 'IAX2/216.207.245.8:4569-1'
>  == Everyone is busy/congested at this time (1:0/1/0)
> But if Asterisk Dials a SIP destination it doesn't have a  
> registration, it waits for a very long time before giving up.
>
> What is the difference?  Does IAX use TCP instead of UDP?  Is there  
> some way to change timeout value in SIP attempt so it gives up in a  
> reasonable time?
>
Both protocols use UDP, bot the timers are a bit different. However,  
if there's no registration
both channels should act the same unless there's a configuration  
that's giving wrong information
to chan_sip, like you having a username= or defaultip= setting.

/O