[asterisk-users] Occasional call from "asterisk"

[Bruce B]

I wonder if you can test to see if this happens if you had an analogue phone
set connected. And if it doesn't then I am wondering why Asterisk or Sangoma
card is so sensitive and maybe the sensor can be set a bit higher so these
calls don't end-up ringing like they don't if an analogue phone set was
connected to the line (at least that was my case).

-Bruce

On Mon, Apr 11, 2011 at 9:52 AM, Danny Nicholas <danny at debsinc.com> wrote:

>    ------------------------------
>
> *From:* asterisk-users-bounces at lists.digium.com [mailto:
> asterisk-users-bounces at lists.digium.com] *On Behalf Of *Brian Henning
> *Sent:* Monday, April 11, 2011 8:47 AM
>
> *To:* 'Asterisk Users Mailing List - Non-Commercial Discussion'
> *Subject:* Re: [asterisk-users] Occasional call from "asterisk"
>
>
>
> Bruce B said:
>
> We experience exact same thing on DAHDI with Sangoma USB FXO device on
> short circuited lines. Phantom calls are actually due to a short in the
> lines that happen occasionally.
>
>
>
> -Bruce
>
> Also, Warren Selby said:
>
>
>
> I've seen this on cases where a "phantom" call comes in on a DAHDI channel
> - these calls were the results of faulty wiring on the part of the telco.
> Check your logs for any errors on your DAHDI channels around the time of the
> "ghost" calls.
>
> It could also be a case of someone calls in and then hangs up before the
> call is actually passed to asterisk, and the telco is just slow to hangup
> the call.
>
>
> Hmmmm.  I do see this in the /var/log/asterisk/messages log:
>
>
>
> [Apr  5 00:05:36] NOTICE[9579] chan_dahdi.c: Got event 4 (Alarm)...
>
> [Apr  5 00:05:38] NOTICE[9579] chan_dahdi.c: Got event 5 (No more alarm)...
>
> [Apr  5 00:05:38] NOTICE[9579] chan_dahdi.c: Got event 17 (Polarity
> Reversal)...
>
> [Apr  5 00:05:41] WARNING[2400] chan_dahdi.c: Detected alarm on channel 3:
> Red Alarm
>
> [Apr  5 00:05:42] NOTICE[2400] chan_dahdi.c: Alarm cleared on channel 3
>
> [Apr  5 00:05:51] WARNING[2400] chan_dahdi.c: Detected alarm on channel 2:
> Red Alarm
>
> [Apr  5 00:05:53] NOTICE[2400] chan_dahdi.c: Alarm cleared on channel 2
>
>
>
> …and it appears to coincide directly with an ‘asterisk’ entry in my SIP
> phone’s missed call log.
>
>
>
> Our wiring is sketchy; this is known at our facility.  Some years ago a
> backhoe severed the entire trunk and the repair work was of questionable
> quality.  Also our service entry point / punch-down area is a rat’s nest
> (one building and service is shared by three companies).  I guess I can
> chalk this behavior up to the wiring.
>
>
>
> Thanks for the input!
>
>
>
> Cheers,
>
> ~Brian
>
> *[Danny Nicholas] *
>
> *I’ll add another vote to “shoot the phone company” – our wiring goes to
> heck whenever it rains and we can expect a few ‘phantom calls” from
> Asterisk.*
>
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