[cisco-voip] CME fxo-gs inbound call rings again if far-end hangs up first

[Erick B.]

Have you tried a normal home POTS phone with the phone line on a few
dozen calls to see if any problems happen on a call with the phone
line not attached to the cisco equipment? If you find problem here, it
may be easier to fight the telco on.  On that note, check and make
sure there isn't anything spliced into this line, loose wires, etc.
Also, make sure the analog line is using two wires and not 4 when
plugged into the FXO port.

Have the telco compare the settings for this line to the rest of the
working lines and make sure all their settings are the same on this
line as the others. Is the problem line being fed off different
equipment then the other lines maybe at the CO, etc?

If your not getting anywhere with them, it may be easier to order a
new POTS line and if it works fine, cancel the other one. I've had a
client do that once with a problem analog line and not getting
anywhere.


On Tue, May 18, 2010 at 2:29 PM, John P Callahan
<jcallaha at willamette.edu> wrote:
>
> We have a remote site with a 2811 running CME attached to several POTS lines
> using ground-start signaling on FXO ports.  Each voice port does a plar to
> an IP phone extension.
>
> Everything works great except on one of the lines on inbound calls, if the
> far-end hangs up first, CME sees another phone call about 2 seconds with the
> same caller-id but if the IP phone user picks up they just hear a dial tone.
>  No problem if the IP phone user hangs up the call first or if the call is
> originated from the IP phone (outbound call).  The most common scenario is
> someone calls, the user isn't there, the call gets handled by Unity Express,
> the caller leaves a message, hangs up - then 1-2 seconds later the phone
> rings again, no answer, goes to UE, records a few seconds of dial tone.  IP
> phone shows "2 New Missed Calls" for what was really just one call.
>
> I have confirmed that the problem follows the line and not the port in the
> 2811 that it is connected to.  Tried ports on each of the HWICs - same
> problem with that line.  All the lines come in on a 25 pair cable and
> terminate in a 25 RJ-11 block grounded to the same ground as the rack the
> 2811 is in.
>
> I filled a TAC case and we cranked up the debugging, did a "timing
> sup-disconnect 50" and "timing guard-out 2000" on the port, all to no
> effect.
>
> I filed a repair request with the telco and they reported no problems with
> the line.
>
> The case has been stalled since the occupant of the office moved out and
> they just wanted the number to go to an announcement - now someone is back
> in the office using the same phone number and having the same problem.
>
> My background is more in the network world than the telco world so I am
> wondering if any of you wise folk have experienced a similar problem and can
> suggest what I ask the telco to check before I send them out again?
>
> Thanks in advance,
>
> John
>
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