[asterisk-users] Hang up detection with TDM400P and Telewest/Virgin Media line

[Mike]

On Sun, Oct 12, 2008 at 11:18:40AM +0100, Gordon Henderson wrote:
> On Thu, 9 Oct 2008, Mike wrote:
> 
> I'm guessing this lamp is on an ordinary analogue phone you have?
>

Yeah, this is a bog standard 9 quid analogue phone.

> 
> OK. A bit convoluted this as I'm not local to the PBX, but an IAX trunk, 
> another asterisk and a SIP phone away from it - however I'm looking at 
> verbose console output on the original asterisk box which has an OpenVox 
> card (TDM400 clone) so:
> 
> Telewest line <-> TDM <-> Asterisk <-> IAX trunk <-> Asterisk <-> SIP phone
> 
> I call into the site on their Telewest landline from my mobile (O2). My 
> phone rings, which is to be expected.
> 
> I don't answer it, but hangup my mobile.
> 
> I can't tell if telewest have dropped the line immediately, but from 
> asterisk point of view, the line stays "open" for about another 2-3 
> seconds, then hangs up and asterisk detects it and stops the phone 
> ringing. As far as I can tell, this is all perfectly normal, and it's what 
> I see with BT lines too.
> 
> If I answer it, that's fine too.
> 
> If I then hangup the mobile, the (analogue) line hangs up almost 
> immediately, this is detected almost immediately by asterisk and it clears 
> down the call.
> 
> So that's more or less what I'm expecting.
> 
> Going the other way: Dialled out from my SIP phone to my mobile - when I 
> hungup the mobile the call dropped almost instantly and my SIP phone 
> hungup.
> 
> So again, that's more or less what I expect.
>

Thanks for doing that.  Do you mind showing me your zapata.conf?

> 
> I've heard that Telewest used whatever switch they could get their hands 
> on at the time when they were building their network, and that different 
> regions might well have different equipment in the TW exchanges. More 
> complicated by them buying up the local cable co's (eg. Eurobell in the 
> Plymouth area where this line is), then being sucked into the ntl: monster 
> and now virgin media.
>

Yeah, I gather all the many, small telcos doing cable all eventually
merged together.  I'm trying to get hold of a Telewest engineer to find
out what is going on.  Naturally this is proving challenging...

> > I'm trying to work out what to expect from the line and see if that is
> > consistent with what I am seeing.  Once I know what the phone line is
> > meant to do, then I can work out if it is doing and what I can do with
> > Asterisk to accomodate it.
> 
> Good luck!
> 
> Gordon
>

Mike.