I’m trying to do H.323 between the Cisco and the Asterisk server— so that I can use the PRI card to dial in and out…
What you’re doing-- are you wanting to connect the FXO/FXS ports to the PSTN and route calls back and forth to Asterisk?
That’s what I’d do-- using H.323 or MGCP
Here’s some info on FXS and FXO
(Foreign eXchange Station) The interface provided by the telephone company to its
customers, which includes dial tone, power and ring voltage. The telephone jack
on the wall is an FXS interface. The plug on a telephone is a Foreign Exchange Office
(FXO) interface, which provides on-hook/off-hook loop closure to the telephone company.
Thus, an FXO phone plugs into an FXS jack.
A PBX’s FXO interface is connected to the FXS interface, and all phones (FXO) connect
to the FXS interface on the PBX.
FXS= Foreign eXtension, Station
FXO - Foreign eXtension, Office
If you have 2 analog phone lines (“1FB” or “1B” are typical names for a standard analog
business line) from the phone company, they go into the FXO ports. This type of
card connects lines that provide dialtone FROM the telco TO you. If you have a
device you need to provide dialtone TO, you connect that to an FXS port
(fax, modem, analog phone).
This link provides a good visual:
Hope that helps…