[asterisk-users] PRI trunk between Asterisk servers does not work.

[Ioan Indreias]

On Thu, Jun 28, 2012 at 10:53 PM, Ernie Dunbar <maillist at lightspeed.ca> wrote:
> We have three Asterisk servers, Voip1, Voip2, and Voip3. Voip1 has a
> Wildcard TE405P (3rd Gen), Voip2 has a Wildcard TE410P/TE405P (1st Gen), and
> Voip3 has a Wildcard TE110P. Voip1 is the server that handles our PRI to the
> PSTN and we hope will allow us to failover to other Asterisk servers (ie,
> Voip2 and Voip3). Voip2 is our current production server, and Voip3 is being
> turned into our next production server.
>
> We're trying to build a PRI trunk between Voip1 and Voip3. Curiously enough,
> we've already done this between Voip1 and Voip2, so one would think that the
> same configuration would work between Voip1 and Voip3 as well. However, it
> hasn't gone so smoothly. If you're wondering why we don't just use SIP
> trunking between these servers, it's because faxes are not reliable over SIP
> trunks. I am open to suggestions however.
>
> At any rate, the PRI trunk between Voip1 and Voip3 isn't working, and that's
> my current problem.
>
> - I have built a T1 crossover cable, and it's plugged in between Span 3 on
> Voip1, and Span 1 on Voip3.
> - I have a green light on both PRI cards for the appropriate spans.
> - Both servers detect their cards on boot.
> - DAHDI is installed on both servers, and all diagnostics are good, ie.
> dahdi_test returns good results, dahdi_tool shows that the alarms are OK,
> and executing 'dahdi show status' on the Asterisk console shows the same.
>
> The chan_dahdi.conf configuration for spans 3 and 4 on Voip1 looks like
> this:
>
> ; Span 3: TE4/0/4 "T4XXP (PCI) Card 0 Span 4"
> group=3
> context=default
> switchtype = national
> signalling = pri_net
> channel => 49-71
> group = 63
>
> ; Span 4: TE4/0/4 "T4XXP (PCI) Card 0 Span 4"
> group=4
> context=default
> switchtype = national
> signalling = pri_net
> channel => 73-95
> context = default
> group = 63
>
> Span 4 goes to Voip2, which has a working PRI trunk.
>
> The chan_dahdi configuration for Voip3 looks like this:
>
> group=1
> signalling=pri_cpe
> switchtype=national
> context=local
> channel=>1-23
> dchannel=>24
> ;channel=25-47,49-71,73-95
> rxgain=0
> txgain=0
> busydetect=yes
> busycount=5
>
> resetinterval=1800
>
> I have a test DID, the dialplan for which on Voip1 looks like this:
>
> exten => 604484XXXX,1,Dial(DAHDI/g3/604482YYYY)
>
> But when I call 604484XXXX from my cell phone, I get no output on the
> Asterisk console on Voip3, and this output on Voip1:
>
>
>    -- Executing [604484XXXX at local:1] Dial("DAHDI/5-1",
> "DAHDI/g3/604482XXXX") in new stack
> [Jun 28 12:43:32] WARNING[4219]: app_dial.c:1286 dial_exec_full: Unable to
> create channel of type 'DAHDI' (cause 34 - Circuit/channel congestion)
>  == Everyone is busy/congested at this time (1:0/1/0)
>  == Auto fallthrough, channel 'DAHDI/5-1' status is 'CONGESTION'
>    -- Accepting call from '778839ZZZZ' to '604484XXXX' on channel 0/5, span
> 1
>
> I've also tried connecting span 3 to one of the other ports on Voip2 with
> the same configuration, and I get the same results. I've run loopback tests
> on the TE110P and tested the cable thoroughly.
>
> Any input on this problem is greatly appreciated.
>
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Hello Ernie,

Could you post the dahdi/system.conf from both voip1 and voip3 servers?

I suspect that you have not correctly defined the data channel (dchan
setup should be in system.conf and not in chan_dahdi.conf, where I see
a not necessarily dchannel configuration)

HTH,
Ioan