Guest

Cisco TelePresence Video Communication Server (VCS)

Configuring a video communication network to call an H.323 endpoint from a SIP endpoint by using the H.323 endpoint's E.164 number

Configuring your video communication network so that you can call an H.323 endpoint from a SIP endpoint by using the H.323 endpoint's E.164 number

For SIP endpoints and H.323 endpoints to be able to communicate with one another, there must be a Cisco TelePresence Video Communication Server (Cisco VCS) in the call route which will interwork the call between the two protocols.

SIP endpoints can only make calls in the form of URIs - for example, name@domain. If you do not specify a domain, the SIP endpoint will automatically append its own domain to the number you dial. So if you dial 123 from the SIP endpoint, the search will be placed for 123@domain. If your H.323 endpoint is just registered as 123, then the Cisco VCS will not be able to locate the alias 123@domain.

The solutions are to either:

  1. Ensure all your endpoints, both H.323 and SIP, register with an alias in the form name@domain.
  2. Create a pre-search transform on the Cisco VCS that strips the @domain portion of the alias for those URIs that are in the form of nnn@domain. Refer to the Dial plan and call processing section of the online help or Cisco VCS Administrator Guide for information about how to configure transforms.

This article applies to the following products:

  • Cisco TelePresence Movi
  • Cisco Video Communication Server

June 16th, 2011TAA_KB_178