[asterisk-users] Dahdi Dropping Calls

Fri Jun 29 10:23:15 CDT 2012

I've never seen this on incoming calls, only outgoing calls.

-----Original Message-----
From: asterisk-users-bounces at lists.digium.com [mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of Andrew Colin
Sent: Friday, June 29, 2012 8:11 AM
To: Asterisk Users Mailing List - Non-Commercial Discussion
Subject: [asterisk-users] Dahdi Dropping Calls

Hi Guys

Has anyone seen Dahdi dropping incoming calls with Hangup cause 27?
It only drops whilst we are on the phone?
Its not every single call
Any ideas?

-----Original Message-----
From: asterisk-users-bounces at lists.digium.com [mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of Tony Mountifield
Sent: 29 June 2012 01:52 PM
To: asterisk-users at lists.digium.com
Subject: Re: [asterisk-users] PRI trunk between Asterisk servers does not work.

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 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

Cheers
Tony
--
Tony Mountifield
Work: tony at softins.co.uk - http://www.softins.co.uk
Play: tony at mountifield.org - http://tony.mountifield.org

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