Do you have the VCS, MCU, and endpoints setup to use multiway? Unless all three are configured properly, it won't work. See the VCS Admin Guide, pg 270 for details. The Multiway Deployment Guide will provide step by step instructions to configure each component.
If you have each component setup correct and you still can't get it to work, can you explain in detail what is or isn't happening?
We almost use 35 endpoints, in that one endpoint doesn't works.
I am not able to merge the calls, Video to Video or Video to Audio
E.g. dial out an endpoint and dial second endpoint after i see merge option on the touch panel, when i tap on the merge button it throws a message "Merge Fail"
You can go into Vcs and see the entire call build up and tear down. Those statics can help iron out why the merge is failing. You said the multiway address has been applied to the endpoint correct? If you aren't able to merge and hop into your MCU I'd think it's an improper multiway address, inability to reach the MCU from the endpoint (or vice versa), or maybe your MCU has reached it's maximum call capacity.
