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

[James Sharp]

On 6/28/2012 3:53 PM, Ernie Dunbar 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.


You've got the spans configured as "group = 63" but you're trying to 
dial out on group 3 (DAHDI/g3 rather than DAHDI/g63).