Option 2 is your best choice, keeps the cost down, at the same time meeting your requirement. I would advise doing Alt.Gk or HSRP with Option 2, to add some redundancy.
Option 1 helps you isolate each cluster into its own zone and also helps in autonomous administration. This solution will be more expensive as well. When you grow to 50 or more sites (say) you will start seeing the advantage of doing this model, in combination with a directory GK. If one GK goes out, none of the other sites will be affected as far as inter-cluster calls.
SIP traces provide key information in troubleshooting SIP Trunks, SIP
endpoints and other SIP related issues. Even though these traces are in
clear text, these texts can be gibberish unless you understand fully
what they mean. This document attempts to br...
Please find the attached HTML document, download and open it on your PC.
This provides an easy to use form where you simply answer a few
questions and it will render the proper jabber-config.xml file for you
to copy/paste. There is built in logic to verif...
CUCM Database Replication is an area in which Cisco customers and
partners have asked for more in-depth training in being able to properly
assess a replication problem and potentially resolve an issue without
involving TAC. This document discusses the bas...