[cisco-voip] VG200 FXO hang-up problem

[Teodor Georgiev]

1. You have to read about "answer and disconnect supervision". That is a well 
known problem on analog FXO lines. The analog lines usually do NOT provide 
call supervision. The PSTN switches / PBXes providing BORSCH to analog lines, 
can send call answer/disconnect supervision via polarity reversal on the 
pair. However it is rarely turned on by default. That is why 
"software" (voice based) answer/disconnect supervision has to be used.

http://www.cisco.com/univercd/cc/td/doc/product/software/ios122/122newft/122t/122t2/ft_ansds.htm

2. You have asked your question on the wrong place, IMHO. This looks like a 
Cisco CCM / Unity mailing-list, not a Cisco voip one.

On Friday 27 May 2005 12:04, Steven wrote:
> Hi I wonder if anyone can suggest anything to help.
> I have a CM4.1 with a VG200 gateway. The gateway has 2 dual FXO modules.
> Connecting this to an analogue line from our Siemens exchange works, but I
> have a problem with call disconnects. When an incoming call occurs and the
> call is unanswered, the phone will continue to ring for a very long period
> after the calling party has disconnected.
> I have changed many of the parameters from Loop start to Ground start, etc
> with no effect.
>
> Any help appreciated.
>
> TIA
>
> Steven Jack
> Videoconferencing Manager
> University of Glasgow
> Computing Service
> Glasgow G12 8QQ
> UK
> Tel +44(0)1413303828 Fax +44(0)1413303820
> Email: s.jack at compserv.gla.ac.uk
>
>
>
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