Cisco Cisco TelePresence Video Communication Server Expressway
Appendix 5: Additional Information
B2BUA Registration on Gateway VCSs
The B2BUA FindMe registration function allows personal video endpoints to appear in a similar manner to an endpoint
registered directly to Lync Server with the same credentials as an existing Lync user, but still maintain the benefits of
having the endpoint register to the VCS which is designed to support video calling.
registered directly to Lync Server with the same credentials as an existing Lync user, but still maintain the benefits of
having the endpoint register to the VCS which is designed to support video calling.
The B2BUA registration function also means that the user credentials are no longer needed on each individual video
endpoint. This is possible because the VCS B2BUA is configured as a trusted host to Lync Server. This simplifies the
long term endpoint management since passwords do not need to be regularly updated on the video endpoints.
endpoint. This is possible because the VCS B2BUA is configured as a trusted host to Lync Server. This simplifies the
long term endpoint management since passwords do not need to be regularly updated on the video endpoints.
What Does Register FindMe users as clients on Lync do?
When enabled, FindMe users that are in the shared domain with Lync are registered to Lync Server so that they
appear like Lync clients.
appear like Lync clients.
This means that if a Lync client registers to Lync Server, and a FindMe user is registered as that same user to Lync
Server, when the user is called by another Lync client, the call will be forked to both the registered Lync client and
also to the VCS’s FindMe. This means that Lync clients and all video endpoints configured as primary devices in the
FindMe will ring when called at the Lync client address.
Server, when the user is called by another Lync client, the call will be forked to both the registered Lync client and
also to the VCS’s FindMe. This means that Lync clients and all video endpoints configured as primary devices in the
FindMe will ring when called at the Lync client address.
Without registering the shared domain FindMe user, Lync Server will not fork the call to VCS, but:
■
if a Lync client is registered with the called address then just that Lync client will ring.
■
if there is no Lync client registered but there is a static domain route to the VCS for that domain the call will be
routed to VCS to handle.
routed to VCS to handle.
■
if there is no Lync client registered and there is no static domain route for this call then the call will just fail.
Lync Server only allows FindMe users to register if the FindMe ID being registered is a valid user in the Lync Active
Directory (in the same way that Lync clients can only register if they have a valid account enabled in the Lync AD).
Directory (in the same way that Lync clients can only register if they have a valid account enabled in the Lync AD).
Registering FindMe users also allows the presence of these users to be provided to Lync Server and for ‘in-call’ as
well as ‘available’ and ‘off-line’ status to be provided. Endpoint devices and FindMe entries that are not registered to
Lync Server can only communicate ‘available’ and ‘off-line’ status to Lync Server. The Gateway VCS (or VCSs) must
host the presence server for the domain shared with Lync (example.com) in order for presence to be provided to Lync
Server.
well as ‘available’ and ‘off-line’ status to be provided. Endpoint devices and FindMe entries that are not registered to
Lync Server can only communicate ‘available’ and ‘off-line’ status to Lync Server. The Gateway VCS (or VCSs) must
host the presence server for the domain shared with Lync (example.com) in order for presence to be provided to Lync
Server.
The Gateway VCS must also host the presence server for the domain of the video network (video.example.com). This
is because presence of a FindMe entry can only be provided if the presence status of the device(s) in the active
location of the FindMe entry are hosted on the Gateway VCS. If FindMe entries contain multiple devices in the active
location, VCS will aggregate the presence of those devices whose presence is hosted on the Gateway VCS and
present the appropriate overall presence status.
is because presence of a FindMe entry can only be provided if the presence status of the device(s) in the active
location of the FindMe entry are hosted on the Gateway VCS. If FindMe entries contain multiple devices in the active
location, VCS will aggregate the presence of those devices whose presence is hosted on the Gateway VCS and
present the appropriate overall presence status.
Use of FindMe also allows any endpoint that is referred to in the FindMe to take on the caller ID of that FindMe entry.
This means that whichever video endpoint makes the call, the receiving Lync client and video endpoints will see the
call as having come from the FindMe ID. This is especially useful when the called party wants to return the call; the
return call calls the FindMe ID resulting in all endpoints relating to this FindMe and any Lync clients registered with
this ID all ringing simultaneously – rather than the return call being addressed directly to the single endpoint that made
the call.
This means that whichever video endpoint makes the call, the receiving Lync client and video endpoints will see the
call as having come from the FindMe ID. This is especially useful when the called party wants to return the call; the
return call calls the FindMe ID resulting in all endpoints relating to this FindMe and any Lync clients registered with
this ID all ringing simultaneously – rather than the return call being addressed directly to the single endpoint that made
the call.
Configuring Domains
It is best practice to keep the video endpoints in their own domain, and just have the FindMe users on the Gateway
VCS with the same domain as Lync Server. This avoids any confusion as to what functionality will be received for
each entity. When a call arrives for the FindMe user, FindMe will forward calls appropriately to the defined endpoints,
whichever domain they are in.
VCS with the same domain as Lync Server. This avoids any confusion as to what functionality will be received for
each entity. When a call arrives for the FindMe user, FindMe will forward calls appropriately to the defined endpoints,
whichever domain they are in.
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Cisco VCS and Microsoft Lync Deployment Guide