Configuring Turn Services - Cisco TelePresence Administrator's Manual

The VCS supports up to 1800 relay allocations. This is typically enough to support 100 calls but does
n
depend on the network topology and the number of media stream components used for the call (for
example, some calls may use Duo Video, or other calls might be audio only).
Clustered VCSs: if the requested TURN server's relays are fully allocated the server will respond to the
n
requesting client with the details of an alternative server in the cluster (the TURN server currently with the
most available resources).
The VCS's TURN services are supported over single and dual network interfaces. For dual network
n
interfaces, the TURN server listens on both interfaces but relays are allocated only on the VCS's externally
facing LAN interface.
ICE calls can be made from non-registered devices, but the destination device does need to be registered
n
to the VCS's Local Zone.
Microsoft ICE (which is not standards-based) is not supported by the VCS Expressway's TURN server; to
n
enable communications between the VCS and Microsoft OCS/Lync clients that are registered through a
Microsoft Edge Server you need to use the
The TURN server does not support bandwidth requests. (Note that traversal zone bandwidth limits do not
n
apply.)

Configuring TURN services

TURN relay services are only available on a VCS Expressway. To use
TURN Relay option key (this controls the number of TURN relays that can be simultaneously allocated by
the VCS).
The TURN page (VCS configuration > Expressway >
TURN settings.
The configurable options are:
Field Description
TURN Determines whether the VCS
services offers TURN services to
traversal clients.
Port The listening port for TURN
requests. The default is 3478.
Authentication The realm sent by the server in
realm its authentication challenges.
Media port The lower and upper port in
range start / the range used for the
end allocation of TURN relays.
TURN relay status information
The TURN relays page lists all the currently active TURN relays on the VCS. You can also review further
details of each TURN relay including permissions, channel bindings and counters.
Cisco VCS Administrator Guide (X7.2)
B2BUA for Microsoft OCS/Lync.
TURN) is used to configure the VCS Expressway's
Usage tips
If TURN services are already enabled, any change to the port
number will not come into effect until the TURN services are
stopped and restarted again.
Ensure the client's credentials are stored in the relevant
authentication database.
Firewall traversal
TURN services you also need the
Page 243 of 498
device