I'm not a chan_dahdi expert but I thought I would take a crack at
answering your questions...
On Thu, Apr 12, 2012 at 11:31:37AM -0500, Tim Nelson wrote:
Greetings-
I've had reports of a customer PBX acting strangely to some
inbound calls. Specifically, a call comes into an FXO port, hits a
Dial() to ring a few extensions, but by the time someone answers
the phone, the call has been dropped, and the caller is listening
to on-hold music. There is nothing in the dialplan that would
cause this behavior.
The logs have a couple of odd (to me, maybe normal) items that may
give some information.
After the call comes in, and the SIP endpoints are dialed, I see:
[2012-04-12 08:51:04] DEBUG[7313] chan_dahdi.c: Requested indication 3 on
channel DAHDI/1-1
I have to assume indication 3 means playing ringing tones to DAHDI/1?
This is letting chan_dahdi know that the SIP phones are ringing.
From (AST_CONTROL_RINGING) in include/asterisk/frame.h.
The phones are ringing at this point. In the logs I see this:
[2012-04-12 08:51:06] DEBUG[7313] sig_analog.c: analog_exception 1
[2012-04-12 08:51:06] DEBUG[7313] sig_analog.c: Exception on 13, channel 1
[2012-04-12 08:51:06] DEBUG[7313] sig_analog.c: __analog_handle_event 1
[2012-04-12 08:51:06] DEBUG[7313] sig_analog.c: Got event
ANALOG_EVENT_RINGBEGIN(12) on channel 1 (index 0)
I'm assuming the indication 3 specified earlier was to send ring
tones on DAHDI/1, this simply confirms it?
This is chan_dahdi reporting the event from the kernel drivers that
the FXO port is starting another RING cycle. Depending on how your
dialplan is written, the originating channel won't be answered until
one of the endpoints answer.
Next, one of the phones answered the call, and a new indication is sent:
[2012-04-12 08:51:07] VERBOSE[7313] app_dial.c: -- SIP/102-21ae
answered DAHDI/1-1
[2012-04-12 08:51:07] DEBUG[7313] chan_dahdi.c: Requested indication 22 on
channel DAHDI/1-1
What does indication 22... indicate?
This is chan_dahdi being told that one of the SIP phones has picked
up the call. From AST_CONTROL_CONNECTED_LINE in
include/asterisk/frame.h
There is more to the log, but it is intermingled with a callback
and I'm not easily able to parse it out at the moment. Does any of
the above seem out of place, or does it look 'normal'?
This all looks pretty normal to me.
As an aside, where could a person find a list of indications used
on DAHDI channels, analog and/or PRI/T1?
I'm not sure if there is any place where they are all listed out
besides in the source code.
--
Shaun Ruffell
Digium, Inc. | Linux Kernel Developer
445 Jan Davis Drive NW - Huntsville, AL 35806 - USA
Check us out at: www.digium.com www.asterisk.org
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