The problem I wanna ask is still configurations in the scenario of LAN-to-LAN call. My ISA servers havn't FQDN, and their external Addresses may be dynamic. Should I configure phone number rules, or email rules, or either? And how to configure? In case of email, how to configure 'Host use this service' in DNS Q931 record?
It can't work because there is no consistent way to communicate with one another. If the IP address changes, you can use a hard coded IP address. One way around the dyanamic address is to use a FQDN, but if you don't have that, then how can the servers ever find one another?
Supposing that the local ISA server's addresses are 10.1.1.1 (internal) and 188.8.131.52 (external), and the remote ISA server's external address are 184.108.40.206, how should i configure? Host A used by me registers on the local ISA server's GK with phone number 79318. Host B is behind the remote ISA server, and registers on its GK with phone number 50241. Because NetMeeting registers on GK, I cannot place gateway-based outgoing calls. How should I place calls to host B? Thx!
Although your systems may not have a static IP, and may not have a FQDN from your ISP, all you have to do is use one of the many Dynamic DNS providers out there, such as: http://www.no-ip.com http://www.dyndns.org/
Once you have created an account, downloaded and installed the update utility, and also created the appropriate protocol filter in ISA server to allow it to update the dynamic DNS server, you will end up with a FQDN in the format such as: <yournamehere>.no-ip.com
All you then have to do is create a gateway with the other systems dynamic DNS FQDN, and then create an appropriate rule to route calls for specific telephone numbers or email addresses to that remote gateway.
Sounds good! If it sounds like we're not being that helpful, its because configuring the H.323 is rather complex and usually requires a lot of trial and error to get things right. The only way I could really confidently tell you how to set things up, step by step, is to put together your scenario and test it out. I could do that, but then I would need to get a consulting fee
Don't be frustrated. H.323 always takes a while to get working. But once you figure it out, it will continue to work and you'll be very happy