[asterisk-users] Connecting a Rolm CBX to Asterisk via T1?

[Lee Howard]

Joshua Kinard wrote:
> So I'm trying to work on this complex fax server setup, and part of it involves connecting my asterisk server to my Rolm CBX switch, via a T1 line.  I plan on using Asterisk simply as a T1-PRI Bridge to IAXmodem (which in turn, activates HylaFax+ to handle the faxing).  So far, though, I don't think I'm getting 100% of the way there.  When dialing the fax extension from my Rolm phone, I get several seconds of silence followed by error tone.  But on asterisk's CLI, I see this:
>
>     -- Starting simple switch on 'Zap/2-1'
>     -- Starting simple switch on 'Zap/3-1'
>     -- Starting simple switch on 'Zap/4-1'
>     -- Starting simple switch on 'Zap/1-1'
>   

So, okay, there are four calls coming in on the Zap (strange, but...)

>     -- Executing [s at fax-in:1] Dial("Zap/2-1", "IAX2/iaxmodem0/s|10|r") in new stack
>     -- Called iaxmodem0/s
>     -- Call accepted by 127.0.0.1 (format ulaw)
>     -- Format for call is ulaw
>     -- IAX2/iaxmodem0-5 is ringing
>     -- IAX2/iaxmodem0-5 answered Zap/2-1
>   

iaxmodem0 correctly takes the first call...

>     -- Executing [s at fax-in:1] Dial("Zap/3-1", "IAX2/iaxmodem0/s|10|r") in new stack
>     -- Called iaxmodem0/s
> [Feb 15 15:40:22] WARNING[24329]: chan_iax2.c:7542 socket_process: Call rejected by 127.0.0.1: Busy
>     -- Hungup 'IAX2/iaxmodem0-1'
>   == Everyone is busy/congested at this time (1:0/0/1)
>   == Auto fallthrough, channel 'Zap/3-1' status is 'CHANUNAVAIL'
>     -- Executing [s at fax-in:1] Dial("Zap/4-1", "IAX2/iaxmodem0/s|10|r") in new stack
>     -- Called iaxmodem0/s
> [Feb 15 15:40:30] WARNING[24327]: chan_iax2.c:7542 socket_process: Call rejected by 127.0.0.1: Busy
>     -- Hungup 'IAX2/iaxmodem0-3'
>   == Everyone is busy/congested at this time (1:0/0/1)
>   == Auto fallthrough, channel 'Zap/4-1' status is 'CHANUNAVAIL'
>     -- Hungup 'Zap/3-1'
>     -- Executing [s at fax-in:1] Dial("Zap/1-1", "IAX2/iaxmodem0/s|10|r") in new stack
>     -- Called iaxmodem0/s
> [Feb 15 15:40:35] WARNING[24327]: chan_iax2.c:7542 socket_process: Call rejected by 127.0.0.1: Busy
>     -- Hungup 'IAX2/iaxmodem0-4'
>   == Everyone is busy/congested at this time (1:0/0/1)
>   == Auto fallthrough, channel 'Zap/1-1' status is 'CHANUNAVAIL'
>     -- Hungup 'Zap/4-1'
>   

And the other calls get busy and improperly run through the auto 
fallthrough process (you *need* a Hangup in your dialplan fax-in context).

> The Rolm gives me error tone just before the "Starting simple switch" messages begin to appear, so it's almost like the Rolm is not waiting around long enough for the asterisk server to answer, before it jumps to the next configured T1 channel, runs out of channels (I only configured four in the Rolm and on asterisk).
>   

I think that your zaptel/zapata configuration between the Rolm and 
Asterisk on that T1 is misconfigured.  Set it up for PRI if you can... 
it'll be a lot easier, is my guess.

Thanks,

Lee.