Hi Prakash,
How does your TelePresence Server being deployed?
- is it locally managed (standalone) or remotely managed (with Cisco Telepresence Conductor, CUCM, VCS, TMS)?
What kind of 3rd party video endpoint (Polycom? LifeSize? etc..)
If locally managed, the endpoint can join to the conference hosted by the Telepresence server by using either of these methods:
1. From the endpoint, dial the Telepresence Server's IP address + the numeric ID of the conference.
2. On the Telepresence Server conference, you can join the endpoint by entering it's IP address and the Telepresence sever will dial out the endpoint.
Refer to this link for more guides:
http://www.cisco.com/c/en/us/support/conferencing/telepresence-server/products-maintenance-guides-list.html
Thanks and regards,
Ace