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

[Ernie Dunbar]

Quoting Tony Mountifield <tony at softins.co.uk>:

> In article <4FECCD0C.1020000 at fivecats.org>,
> James Sharp <james at fivecats.org> wrote:
>> 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).
>
> No, the group=63 lines are actually redundant. It is the settings *above*
> each channel=> line that get applied to the channels when they are created.
>
> To the OP: what does "pri show span 3" give you on Voip1?
>

It looks like this:

# asterisk -rx 'pri show span 3'
Primary D-channel: 72
Status: Provisioned, Down, Active
Switchtype: National ISDN
Type: Network
Window Length: 0/7
Sentrej: 0
SolicitFbit: 0
Retrans: 0
Busy: 0
Overlap Dial: 0
Logical Channel Mapping: 0
T200 Timer: 1000
T203 Timer: 10000
T305 Timer: 30000
T308 Timer: 4000
T309 Timer: -1
T313 Timer: 4000
N200 Counter: 3

The only differences I see between 'pri show span 3' and 'pri show  
span 4' are that the status on span 4 is "Provisioned, Up, Active" and  
that the D-channel is different, which is to be expected.

> It might be useful to see the complete chan_dahdi.conf from Voip1.
> To save space, you can list it without comments like this:
>
> # grep -v '^;' /etc/asterisk/chan_dahdi.conf

Okay, here you go:

[channels]
usecallerid=yes
cidsignalling=bell
cidstart=polarity

facilityenable=yes
hidecallerid=no
callwaitingcallerid=yes
callwaiting=no
threewaycalling=yes
transfer=yes
echocancel=yes
echocancelwhenbridged=no
immediate=no

group=1
signalling=pri_cpe
switchtype=national
pridialplan=unknown
relaxdtmf=yes
context=local
channel=>1-23
rxgain=0
txgain=0
busydetect=yes
busycount=5

resetinterval=3600

#include dahdi-channels.conf

And dahdi-channels.conf looks like:

group=3
context=default
switchtype = national
signalling = pri_net
channel => 49-71

group=4
context=default
switchtype = national
signalling = pri_net
channel => 73-95



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