[Asterisk-Users] FXS signalling for Ireland

[Ronan Mullally]

Hi,

I've installed a TDM400 card in an aging Dell Optiplex GXa (see my post a 
few weeks ago).  The machine powers the card okay, it shows up in an 
'lspci', and asterisk runs fine with it.  I've tried both 1.0.4 and 1.0.5.
The box in question is running a 2.4 kernel.

However... I'm having trouble getting the card to work with a variaty of 
handsets attached to the FXS ports.  One handset is a standard Telecom 
Eireann 'Boyne' handset, the other an NTL DECT handset purchased in the 
UK (RJ11 plug, works fine attached to the PSTN).  Funnily enough, I've got 
an identical card installed in a machine in the UK attached to a Siemens 
Gigaset DECT phone purchased in Ireland, which is running without any 
trouble...

I'm seeing the following rather wierd behaviour:

  - Incoming Pots calls, sent directly to the echo test app work fine

  - Outgoing calls from FXS ports to the PSTN work fine

  - Calls between FXS extensions work fine for the most part

  - Incoming calls sent to an FXS port will ring the FXS port.  Upon
    pickup the bridging of the two fails.  The incoming call continues to
    ring.  If I drop the FXS, pick it up again, drop it, and pick it up a
    third time it will finally answer.  The first two attempts result in
    a distorted ring tone being heard on the handset.

I suspect the problem is down to FXS signalling.  I've tried a variety of 
loop, kewl and ground start as well as E&M.  Does anybody have any
suggestions regarding the zaptel / zapata config for these handsets?
I'd none of these problems when I installed my TDM400 card in my UK
box which runs 1.0.4 and a 2.6 kernel.

Any suggestions welcome...


-Ronan