[asterisk-users] Sending calls to a particular T1 port.

[Steve Totaro]

On Fri, Nov 12, 2010 at 1:17 PM, Ernie Dunbar <maillist at lightspeed.ca>wrote:

> We have two Asterisk servers. One is a live server supporting our
> customers, and the other is a backup server that's being upgraded and
> pressed into service. Both servers have a Digium TE405P T1 card in them,
> and in order to test the T1 service on the backup server, I've created a
> T1 crossover cable (as per
> http://www.voip-info.org/wiki/view/crossover+T1+cable) that goes from port
> 4 on the live server to port 1 on the backup server. Both TE405P's have
> been configured, and I get a green light on port 4 on the live server and
> port 1 on the backup server.
>
> The problem I have is trying to route calls through this T1 connection. To
> the best of my knowledge, this configuration on the live server should
> work:
>
> In /etc/asterisk/chan_dahdi.conf:
>
> group=4
> context=local
> switchtype = national
> signalling = pri_cpe
> channel => 73-95
> context = default
> group = 63
>
> In /etc/asterisk/extensions.conf:
>
> exten => _*88,1,Dial(DAHDI/g4/123456789)
>
> However, in the Asterisk console, I get this error on the live server:
>
>    -- Executing [*88 at lightspeedout:1] Dial("SCCP/lightspeed7-00000062",
> "DAHDI/g4/123456789") in new stack
> [Nov 12 09:24:41] WARNING[1970]: app_dial.c:1286 dial_exec_full: Unable to
> create channel of type 'DAHDI' (cause 0 - Unknown)
>  == Everyone is busy/congested at this time (1:0/0/1)
>  == Auto fallthrough, channel 'SCCP/lightspeed7-00000062' status is
> 'CHANUNAVAIL'
>
> And no messages at all on the backup server, except this one every 4
> seconds:
>
> [Nov 12 10:08:04] WARNING[4473]: chan_dahdi.c:4169 pri_find_dchan: No
> D-channels available!  Using Primary channel 24 as D-channel anyway!
>
> Which Googling reveals to be a fairly mundane and harmless warning message
> (it happens on real T1's apparently, and isn't related to any kind of
> outage).
>
> Also, I'm not entirely sure how to enable changes to chan_dahdi.conf
> without restarting asterisk or otherwise killing the 15+ DAHDI channels in
> progress. Doing this at off-peak times is very slow, as I'm asleep during
> those times, and thus it can only happen once per day.
>
>
>
On the main server, if you type, dahdi show channels or whatever, do you see
the fourth span?

Your configuration should probably be signalling = pri_net and the new
server should be signalling = pri_cpe

Thanks,
Steve T
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