Cisco Cisco TelePresence Video Communication Server Expressway 관리 매뉴얼
example, some calls may use Duo Video, or other calls might be audio only).
n
system supports up to 6000 relays, spread evenly across 6 ports where each port is limited to
handling 1000 relays. This limit is not strictly enforced, so we recommend adding an SRV record for each
port to enable round robin.
port to enable round robin.
n
Clustered VCSs: if the requested TURN server's relays are fully allocated the server will respond to the
requesting client with the details of an alternative server in the cluster (the TURN server currently with the
most available resources).
requesting client with the details of an alternative server in the cluster (the TURN server currently with the
most available resources).
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The VCS's TURN services are supported over single and dual network interfaces (via the Advanced
Networking option). For dual network interfaces, the TURN server listens on both interfaces but relays are
allocated only on the VCS's externally facing LAN interface.
Networking option). For dual network interfaces, the TURN server listens on both interfaces but relays are
allocated only on the VCS's externally facing LAN interface.
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Media negotiation may fail when VCS Control version X7.2 (or newer) TURN client negotiates with VCS
Expressway version X7.1 TURN server. Because the more recent client version can support IPv6 TURN,
it adds a new attribute in the request to the server (irrespective of whether the request is for IPv4 or IPv6
TURN). The X7.1 TURN server does not understand the new attribute.
You can work around this issue by upgrading the VCS Expressway to version X7.2 or newer, preferably
the same version as on the VCS Control. We recommend that you maintain the same software versions
on the VCS Control and VCS Expressway.
Expressway version X7.1 TURN server. Because the more recent client version can support IPv6 TURN,
it adds a new attribute in the request to the server (irrespective of whether the request is for IPv4 or IPv6
TURN). The X7.1 TURN server does not understand the new attribute.
You can work around this issue by upgrading the VCS Expressway to version X7.2 or newer, preferably
the same version as on the VCS Control. We recommend that you maintain the same software versions
on the VCS Control and VCS Expressway.
n
Microsoft ICE (which is not standards-based) is not supported by the VCS Expressway's TURN server; to
enable communications between the VCS and Microsoft Lync clients that are registered through a
Microsoft Edge Server you need to use the
enable communications between the VCS and Microsoft Lync clients that are registered through a
Microsoft Edge Server you need to use the
.
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The TURN server does not support bandwidth requests. Traversal zone bandwidth limits do not apply.
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The VCS Expressway TURN server supports TURN media over TCP and UDP. Configuration of the
supported protocols is available only through the CLI command xConfiguration Traversal
Server TURN ProtocolMode
supported protocols is available only through the CLI command xConfiguration Traversal
Server TURN ProtocolMode
.
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The VCS Expressway TURN server supports UDP relays over TCP; it does not currently support
TCP relays.
TCP relays.
Configuring TURN services
TURN Relay option key (this controls the number of TURN relays that can be simultaneously allocated by
the TURN server).
the TURN server).
The
TURN
page (
Configuration > Traversal > TURN
) is used to configure the VCS Expressway's TURN
determine, via the Authentication realm, the traversal zone through which credential checking of TURN
server requests is delegated.
server requests is delegated.
The configurable options are:
Field
Description
Usage tips
TURN
services
services
Determines whether the VCS offers TURN services to
traversal clients.
traversal clients.
Cisco TelePresence Video Communication Server Administrator Guide (X8.5.2)
Page 66 of 567
Firewall traversal
About ICE and TURN services