On Tue, 8 Apr 2008 11:54:26 UTC, Tim <nutnews@kooky.org> wrote:

> Dave Saville wrote:
> > I have a Siemens S450IP and it normally dials out on one of my VOIP
> > connections (Voiptalk.org). If my wife calls our doctor's, which has
> > some fancy pbx, after a few seconds of talking to the receptionist it
> > drops out to an engaged tone. This is very repeatable, and is somewhat
> > anoying. Today she was getting *really* cross so I said to force it
> > out over BT. She did this and of course it was perfect. Now I realise
> > that this is a typical example of one, to assume that BT will always
> > work, but has anyone any ideas what might be going on? It drops out in
> > the middle of sentences so can't be any silence detection thing.
> >
>
> There are 2 ways to diagnose this problem
>
> 1) run wireshark locally and see whether the phone is sending a hangup
> (BYE) message or not.
>
> 2) Ask Voiptalk to look in their logs and see what is going on.
>
>
> You could also try a call with another SIP provider to see if that makes
> any difference (although interesting, this doesn't rule out a phone problem)

Thanks for the suggestions Tim. After posting I remembered that I had
had a similar problem a few weeks back when my wife was in hospital.
Calling her room via VOIP nearly always did a similar thing. However,
I can't recall what happened when the call dropped - dial tone or
whatever. Now what is interesting is that last year she was in the
same hospital and VOIP worked fine to her room. The difference is that
then I was using a different DECT phone, a Zyxel ATA and a different
SIP provider. Talk about changing one thing at a time to debug :-)

I think 1) is favourite - just a bit of recabling to do it. (Have to
get the base off my switch to a hub so I can trace it.) What does a
hang up look like? Does it actually say BYE?


--
Regards
Dave Saville

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