[asterisk-users] IAX problem through intermediate asterisk box

[Andrew Hakman]

I initially had no trunking anywhere, and had the same behavior. I
thought trunking would help, but I can't figure out why the /dev/dahdi
device doesn't get created on C. The dahdi tools / modules don't seem
to have much error / debugging info available, or if they do, I sure
can't find it anywhere obvious.

Andrew

On Thu, Mar 26, 2009 at 11:39 PM, Brandon B. <brandon at brellsystems.com> wrote:
> Here's my troubleshooting help -- since the problem sounds like a timing
> issue and part of the call is being trunked, then fix your timing problem,
> or remove the trunking from A and B then see if the problem goes away.
>
> On Thu, Mar 26, 2009 at 10:50 PM, Andrew Hakman <andrew.hakman at gmail.com>
> wrote:
>>
>> So no one else has a problem routing IAX traffic through an
>> intermediate Asterisk server? Does anyone else use Asterisk in such a
>> configuration?
>>
>> On Thu, Mar 26, 2009 at 2:45 AM, Andrew Hakman <andrew.hakman at gmail.com>
>> wrote:
>> > I'm having a problem with IAX running through an intermediate asterisk
>> > box. Perhaps a small diagram will explain the situation better:
>> >
>> > *A ------- [cloud (public internet)] ------- *B --------[cloud
>> > (private network)]----------- *C
>> >
>> > Asterisk server's A, B, and C, are all connected together with IAX
>> > All asterisk servers are 1.6.0.6
>> > Server A and B are geographically close, but connected over the public
>> > internet.
>> > Server B and C are geographically far, but connected over a private
>> > network.
>> > (the latency between A and B, and B and C are roughly equal)
>> >
>> > Each server has at least 1 phone hanging off of it, with A and C
>> > having most of the phones (B only has a couple).
>> > A's extensions are all 1XXX, B's are 2XXX, and C's are 3XXX
>> >
>> > Phoning from A to B (or vice versa) works well, as does phoning from B
>> > to C (and vice versa). Calls can be placed for an indefinite amount of
>> > time and everything works great.
>> >
>> > The problem arises when phoning from A through B to C (or vice versa).
>> > For the first small amount of time (which can vary on a call to call
>> > basis, and lasts from 0 seconds to 3 minutes or so) everything is
>> > fine. After this, the audio in both directions gets garbled, and
>> > starts arriving in spurts. Once this happens, it continues forever.
>> > The audio never returns to normal no matter how long you wait.
>> >
>> > A to B uses IAX with trunking. B to C is not using trunking
>> > (dahdi_dummy is not working well on C for some reason - the module
>> > loads, but no /dev/dahdi is ever created). The same behavior happens
>> > when A to B is not using trunking either.
>> >
>> > Usually only 1 call is being placed at a time. An interesting thing
>> > happens when 2 testcalls are in progress at the same time though. If
>> > there's a call from A to B, and a call from A to C is made, once the
>> > call from A to C becomes garbled, so does the A to B call. When the A
>> > to C call is ended, the A to B call clears up. Ending the A to B call
>> > first does not improve the A to C call.
>> >
>> > The dialplans are setup so each server passes all non-local extensions
>> > to it's neighbor.
>> >
>> > Hence, for A, the relevant part of the dialplan is
>> >
>> > exten => _2XXX,1,Verbose(1|Extension 2xxx)
>> > exten => _2XXX,n,Dial(IAX2/asterisk_B/${EXTEN})
>> > exten => _2XXX,n,Hangup()
>> >
>> > exten => _3XXX,1,Verbose(1|Extension 3xxx)
>> > exten => _3xxx,n,Dial(IAX2/asterisk_B/${EXTEN})
>> > exten => _3xxx,n,Hangup()
>> >
>> > For B:
>> >
>> > exten => _1XXX,1,NoOp()
>> > exten => _1XXX,n,Dial(IAX2/asterisk_A/${EXTEN})
>> > exten => _1XXX,n,Hangup()
>> >
>> > exten => _3xxx,1,NoOp()
>> > exten => _3xxx,n,Dial(IAX2/asterisk_C/${EXTEN})
>> > exten => _3xxx,n,Hangup()
>> >
>> >
>> > For C:
>> > exten => _2XXX,1,Verbose(1|Extension 2xxx)
>> > exten => _2XXX,n,Dial(IAX2/asterisk_B/${EXTEN})
>> > exten => _2XXX,n,Hangup()
>> >
>> > exten => _1XXX,1,Verbose(1|Extension 1xxx)
>> > exten => _1XXX,n,Dial(IAX2/asterisk_B/${EXTEN})
>> > exten => _1XXX,n,Hangup()
>> >
>> > Is this the proper way to set such a configuration up? Is there a
>> > better way to call from A through B to C that would work better?
>> > Anyone else experience total audio breakup after a while with a
>> > similar arrangement? Why does it work initially for up to about 3
>> > minutes, then completely fall apart?
>> >
>> > Thanks,
>> > Andrew
>> >
>>
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