[asterisk-users] TDM400 with FXS some handsets not ringing

[Mike]

Folks,

I have a TDM400 with an FXS module.  I'm having some trouble ringing
some phones attached to the device.

I have a real el cheapo handset that cost me about 9UKP.  It works fine,
I plug it into the Wildcard and call the channel and it rings.

I have tried plugging in my BT Diverse 3016 cordless phone but it will
not ring, although I can call out from it.

I have also tried my GPO 332L (a rotary dial phone from the 1950's),
this also does not ring however, I can pick up the phone and make a
connection.

Are there any limitations to the ringer on the FXS module?  Is there
anything I can do to make my other phones ring?

Thanks,
Mike.