Enabling Sip Endpoints To Dial H.323 Numbers - Cisco TelePresence Video Communication Server Administrator's Manual

protocol only (because it will interwork the call only if one of the endpoints is locally registered).
If Interworking mode is set to On, or the request has come from a locally registered endpoint, the
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VCS will search the local zone and all external zones using both protocols.
Note: calls for which the VCS acts as a SIP to H.323 gateway are traversal calls. They will therefore
require a traversal call license.

Enabling SIP endpoints to dial H.323 numbers

SIP endpoints can only make calls in the form of URIs - e.g. name@domain. If the caller does not
specify a domain when placing the call, the SIP endpoint will automatically append its own domain to
the number that is dialed.
So if you dial 123 from a SIP endpoint, the search will be placed for 123@domain. If the H.323
endpoint being dialed is just registered as 123, the VCS won't be able to locate the alias 123@domain
and the call will fail. The solutions are to either:
Ensure all your endpoints, both H.323 and SIP, register with an alias in the form name@domain.
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Create a pre-search transform on the VCS that strips the @domain portion of the alias for those
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URIs that are in the form of number@domain.
Refer to the pre-search transforms
transforms, and to the
how to do this.
Cisco VCS Administrator Guide (X6.1)
section for information about how to configure pre-search
stripping @domain for dialing to H.323 numbers
Protocols
section for an example of
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