asterisk users - Nov 2008 - TDM400 with FXS some handsets not ringing

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.

There is going to be a bit of a current output limit on the FXS card.  
For the actual limit you will need to contact the manufacturer.  Phones 
that use digital ringers will be much more likely to work than phones 
that use mechanical ringers.

Mike wrote:
> 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.
>
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On Thu, 6 Nov 2008, Mike wrote:
> 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?
Are you using a ring-adapter for the UK that includes the capacitor to put 
the ringing current on pin 3? Something like this:

http://www.voipon.co.uk/rj11-adaptor-with-ring-capacitor-p-278.html

Or take the output of the TDM card and punch it into a BT "master"
socket
and take the phones off that.

A lot of modern (ie. cheap import) phones don't need it, but some still 
do. My refurb. 746 needs this. (1960's rotary dial)

Gordon