[Asterisk-Users] Digium Cards connecting to BT

[John Novack]

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