asterisk users - Jan 2005 - spa 2000 phones do not ring

Ok, here's a weird one.

I've attached a spa2000 to asterisk, and got the two phones to register 
as exten 706 and 707.

I can call exten 708 (a cisco 7940) from 707 and everything works fine.
I can call exten 708 from 706 and everything works fine.

When I make a call to either 706 or 707 from any phone, the phone 
attached to the spa does not ring. However, if I pick up the appropriate 
phone, the connection is made and normal conversation can take place.

I've tried changing all the appropriate settings to no avail. (FXS settings)

Anyone had a similar issue ?

Julian.

> When I make a call to either 706 or 707 from any phone, the phone 
> attached to the spa does not ring. However, if I pick up the appropriate 
> phone, the connection is made and normal conversation can take place.
I had the same problem with a Cisco 827-4V.  It turned out that the
phones were fussy about ringing frequency, given the relatively low
output voltage from the SLIC on most FXS devices.  The command
"pots ringing-freq 50Hz" fixed it.

On the SPA, under "Ring and CWT Cadence", you can set ring waveform,
frequency, and voltage.  Try increasing the voltage, and/or setting
the frequency up to 50 Hz or down to 20 Hz.

--Stewart