Cisco Cisco TelePresence Video Communication Server Expressway 관리 매뉴얼
Protocols
Cisco VCS Administrator Guide (X7.0)
Page 87 of 488
Configuring SIP and H.323 interworking
The
Interworking
page (
VCS configuration > Protocols > Interworking
) lets you configure whether
or not the VCS acts as a gateway between SIP and H.323 calls. The translation of calls from one
protocol to the other is known as “interworking”.
protocol to the other is known as “interworking”.
By default, the VCS acts as a SIP-H.323 and H.323-SIP gateway but only if at least one of the endpoints
that are involved in the call is locally registered. You can change this setting so that the VCS acts as a
SIP-H.323 gateway regardless of whether the endpoints involved are locally registered. You also have
the option to disable interworking completely.
that are involved in the call is locally registered. You can change this setting so that the VCS acts as a
SIP-H.323 gateway regardless of whether the endpoints involved are locally registered. You also have
the option to disable interworking completely.
The options for the H.323 <-> SIP interworking mode are:
n
Off: the VCS does not act as a SIP-H.323 gateway.
n
Registered only: the VCS acts as a SIP-H.323 gateway but only if at least one of the endpoints is
locally registered.
locally registered.
n
On: the VCS acts as a SIP-H.323 gateway regardless of whether the endpoints are locally registered.
You are recommended to leave this setting as Registered only (where calls are interworked only if at
least one of the endpoints is locally registered). Unless your network is correctly configured, setting it to
On (where all calls can be interworked) may result in unnecessary interworking, for example where a call
between two H.323 endpoints is made over SIP, or vice versa.
least one of the endpoints is locally registered). Unless your network is correctly configured, setting it to
On (where all calls can be interworked) may result in unnecessary interworking, for example where a call
between two H.323 endpoints is made over SIP, or vice versa.
Calls for which the VCS acts as a SIP to H.323 gateway are
.
Searching by protocol
When searching a zone, the VCS first performs the search using the protocol of the incoming call. If the
search is unsuccessful the VCS may then search the zone again using the alternative protocol,
depending on where the search came from and the Interworking mode.
search is unsuccessful the VCS may then search the zone again using the alternative protocol,
depending on where the search came from and the Interworking mode.
n
If the request has come from a neighboring system and Interworking mode is set to Registered only,
the VCS searches the local zone using both protocols, and all other zones using the native protocol
only (because it will interwork the call only if one of the endpoints is locally registered).
the VCS searches the local zone using both protocols, and all other zones using the native protocol
only (because it will interwork the call only if one of the endpoints is locally registered).
n
If Interworking mode is set to On, or the request has come from a locally registered endpoint, the
VCS searches the local zone and all external zones using both protocols.
VCS searches the local zone and all external zones using both protocols.
Enabling SIP endpoints to dial H.323 numbers
SIP endpoints can only make calls in the form of URIs — such as name@domain. If the caller does not
specify a domain when placing the call, the SIP endpoint automatically appends its own domain to the
number that is dialed.
specify a domain when placing the call, the SIP endpoint automatically appends 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 will not be able to locate the alias 123@domain and the
call will fail. The solutions are to either:
being dialed is just registered as 123, the VCS will not be able to locate the alias 123@domain and the
call will fail. The solutions are to either: