asterisk users - Jul 2005 - [Q]: Asterisk + gnugk + BRI ISDN as H.323/ISDN gateway?

Hi....

I am currently using gnugk (www.gnugk.org) as a H.323
gatekeeper/proxy, mostly for our video conferencing devices.

What I would now like to do is add ISDN functionality to this and make
our H.323 gatekeeper box also function as an ISDN <---> H.323 gateway
so that H.323 endpoints can call ISDN devices, and vice versa. I
currently have 3 BRI ISDN lines, but in order to use them I have to
connect them to a specific video conf unit which supports ISDN (not
all of our VC units do) and I also need to repatch the lines to
wherever the unit is needed....I would like to eliminate this by
plugging the BRI lines into the gateway and making ISDN connectivity
available to all our VC units (both ISDN and non ISDN units.....they
all support H.323).

I had thought of using asterisk to take incoming ISDN calls and relay
them as H323 to our gatekeeper/proxy. I was just wondering if anyone
could help me with the following:

1. Is this possible with Asterisk + gnugk?
2. If so, can anyone recommend a multiport (preferrably 4 ports) BRI
ISDN card which will work with asterisk?
3. Can asterisk do channel bonding so that multiple BRI ISDN can be
used together for a video conference? Would this channel bonding work
in both directions (i.e. H.323 --> ISDN and ISDN --> H.323)?

If anyone has done this and has a working config, I would be most
grateful for a copy.

Thanx muchly in advance for any help.

Chris Bradshaw.