GSLB, Only the solution?

[joong-holee]

We have two VoIP Softswitch systems at the different network for disaster recovery.

I want to use these VoIP SSW for backup.

If these two systems are in the geographically different locations and networks, what solution and protocol and devices will be necessary ?

[thomas.chen]

Try:

http://www.cisco.com/en/US/netsol/ns641/networking_solutions_white_paper0900aecd80104370.shtml