asterisk users - Jun 2007 - Phantom calls: Detecting hangup quicker

Dear all,

We seem to be getting phantom calls when a inbound caller via the
legacy pbx hangups before
the SIP handsets have answered. The extensions also seem to hear
ringing on the lines too sometimes.

                                       SIP Inbound  >----
                                                               |
legacy pbx (analogue) <-> (sangoma a400d) asterisk <-> SIP phones

Basically if a user hangups before the call has bridged, I think.

Is there anything we can do about this?

Thanks,

Gavin.

Gavin Henry wrote:
> Dear all,
> 
> We seem to be getting phantom calls when a inbound caller via the
> legacy pbx hangups before
> the SIP handsets have answered. The extensions also seem to hear
> ringing on the lines too sometimes.
> 
>                                       SIP Inbound  >----
>                                                               |
> legacy pbx (analogue) <-> (sangoma a400d) asterisk <-> SIP
phones
> 
> Basically if a user hangups before the call has bridged, I think.
> 
> Is there anything we can do about this?
Yet another "call progress detection" issue.

Analog lines are problematic this way. Search the archives for "call
progress detection" or "disconnect supervision".

-Stephen-