Cisco Cisco TelePresence Video Communication Server Expressway 관리 매뉴얼

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D14049.08 
November 2010

Grey Headline (continued)

CISCO TELEPRESENCE

 VIDEO COMMUNICATION SERVER

ADMINISTRATOR GUIDE

Configuring the Cisco VCS as a traversal server

Overview

The VCS Expressway can act as a firewall 
traversal server. This feature means you can:

• 

Allow your VCS to act as a traversal server 
for other VCSs and TANDBERG Gatekeepers. 
You do this by adding a new traversal server 
zone on the VCS, and configuring it with 
details of the traversal client.

• 

Provide firewall traversal for any traversal-
enabled endpoints (i.e. Cisco MXP endpoints 
and any other endpoints that support the 
ITU H.460.18 and H.460.19 standards) 
registered directly with it. You can configure 
the protocols and ports that will be used.

• 

Enable and configure TURN services.

• 

Configure the ports used specifically for 
firewall traversal services.

The following sections describe how to 
configure each of the above options.

To enable your VCS Expressway to act as a 
traversal server for a traversal client (e.g. a 
VCS Control or Gatekeeper) you must create a 
connection between it and the client system.
You do this by adding a new traversal server 
zone on the VCS server and configuring it with 
the details of the traversal client.
To add a new traversal server zone:

• 

VCS configuration > Zones.
You are taken to the Zones page.
Click New.
You are taken to the Create zone page.

• 

To edit an existing traversal server zone:

• 

VCS configuration > Zones.
You are taken to the Zones page.
Click on the name of the zone you want to 
configure. 
You are taken to the Edit zone page.

• 

• 

For details on the configuration options 
available for traversal server zones, see the 

 section.

Adding and configuring a traversal 

server zone

Configuring traversal for endpoints

Overview

Traversal-enabled H.323 endpoints can register 
directly with the VCS Expressway and use it for 
firewall traversal. 
To configure the options for these endpoints:

• 

VCS configuration > Expressway> Locally 
registered endpoints 
You are taken to the Locally registered 
endpoints page.

• 

The options available are:

H.323 Assent mode 

Determines whether or not H.323 calls using 
Assent mode for firewall traversal are allowed. 

H.460.18 mode 

Determines whether or not H.323 calls using 
H.460.18/19 mode for firewall traversal are 
allowed. 

H.460.19 demux mode 

Determines whether the VCS Expressway 
operates in demultiplexing mode for calls from 
locally registered endpoints. 
On: allows use of the same two ports for all 
calls. 
Off: each call will use a separate pair of ports 
for media.

H.323 preference

If an endpoint supports both Assent and 
H.460.18 protocols, this setting determines 
which the VCS Expressway uses.

UDP probe retry interval

Sets the frequency (in seconds) with which 
locally registered endpoints send a UDP probe 
to the VCS Expressway.

UDP probe retry count

Sets the number of times locally registered 
endpoints attempt to send a UDP probe to the 
VCS Expressway.

UDP probe keep alive interval

Sets the interval (in seconds) with which locally 
registered endpoints send a UDP probe to the 
VCS Expressway after a call is established, in 
order to keep the firewall’s NAT bindings open.

TCP probe retry interval

Sets the frequency (in seconds) with which 
locally registered endpoints send a TCP probe 
to the VCS Expressway.

TCP probe retry count

Sets the number of times locally registered 
endpoints attempt to send a TCP probe to the 
VCS Expressway.

TCP probe keep alive interval

Sets the interval (in seconds) with which locally 
registered endpoints send a TCP probe to the 
VCS Expressway after a call is established, in 
order to keep the firewall’s NAT bindings open.