asterisk users - Feb 2005 - Digium Cards connecting to BT

Hi there

Just a general question, has anybody experienced any problems with any
Digium telephony cards in the UK, specifically with BT (British Telecom)
lines. I just want to make sure there are no compatibility issues before
purchasing cards, (mainly TDM400P's)

Any comments would be greatly appreciated


Thanks

Hi,

There are several people on the UK mailing list (I am one) that have
purchased the TDM400P FXO and are having problems with disconnect.
Basically the cards are great (sound quality etc) but give some issues with
detecting a UK remote hang-up. Mainly an issue within IVR, MeetMe and VM.

There are several of us trying to get to the bottom of this, either with
fixes or workarounds.

If you only want a couple of lines and ISDN isn't an option perhaps look at
the Sipura 3000 they have one FXO and one FXS interface.  Also they don't
cost the earth are UK approved, and available in the UK so no import duty.

Regards,

Chris

-----Original Message-----
From: asterisk-users-bounces@lists.digium.com
[mailto:asterisk-users-bounces@lists.digium.com] On Behalf Of Brett, Gary
Sent: 14 February 2005 13:24
To: Asterisk Users Mailing List - Non-Commercial Discussion
Subject: [Asterisk-Users] Digium Cards connecting to BT

Hi there

Just a general question, has anybody experienced any problems with any
Digium telephony cards in the UK, specifically with BT (British Telecom)
lines. I just want to make sure there are no compatibility issues before
purchasing cards, (mainly TDM400P's)

Any comments would be greatly appreciated


Thanks
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Brett, Gary wrote:
>Hi there
>
>Just a general question, has anybody experienced any problems with any
Digium telephony cards in the UK, specifically with BT (British Telecom) lines.
I just want to make sure there are no compatibility issues before purchasing
cards, (mainly TDM400P's)
>
>Any comments would be greatly appreciated
>
>  
>
Can't comment on the UK, but you should be aware that the TDM400 is 
pretty insistent about PCI 2.2, and the FXS module does NOT provide a 
ground start configuration. Not a problem if you want just a POTS phone 
connected, but if you were to attempt to set up a two way trunk to a 
conventional PBX, you can only provide a loop start line. SOME versions 
of Asterisk had the loop pulse function not working as well.

Perhaps none of this matters to you, but several collectors are 
attempting to use the Asterisk box as an interface to interconnect our 
old switches via the internet, and find the support for such basic 
telephony somewhat lacking.
Interestingly enough, it seems the chipset used on the TDM 400 module 
supports a ground start configuration, but Digium chose not to make that 
available.

John Novack

> Hi there
> 
> Just a general question, has anybody experienced any problems 
> with any Digium telephony cards in the UK, specifically with 
> BT (British Telecom) lines. I just want to make sure there 
> are no compatibility issues before purchasing cards, (mainly 
> TDM400P's)
> 
> Any comments would be greatly appreciated
I know of about a dozen UK users, myself included, who cannot get the TDM400
FXO modules to do hangup detection correctly on a BT line. I have raised
this with Digium support and they have suggested a fix, as has another user
on this list. I haven't had time to test either fix yet, but will post to
the list if I am successful.

Patrick