Configuring Traversal Client Zones - Cisco TelePresence Administrator's Manual

Configuring traversal client zones

To traverse a firewall, the VCS must be connected with a traversal server (for example a VCS Expressway
or a TANDBERG Border Controller).
In this situation your local VCS is a traversal client, so you create a connection with the traversal server by
creating a traversal client zone on your local VCS. You then configure the client zone with details of the
corresponding zone on the traversal server. (The traversal server must also be configured with details of the
VCS client zone.)
After you have neighbored with the traversal server you can:
use the neighbor as a traversal server
n
query the traversal server about its endpoints
n
apply transforms to any queries before they are sent to the traversal server
n
control the bandwidth used for calls between your local VCS and the traversal server
n
For full details on how traversal client zones and traversal server zones work together to achieve firewall
traversal, see About firewall
An NTP server must be configured for traversal zones to work.
The configurable options for a traversal client zone are:
Field Description
Configuration section:
Name The name acts as a unique identifier, allowing you to
distinguish between zones of the same type.
Type The nature of the specified zone, in relation to the
local VCS. Select Traversal client.
Hop count The hop count is the number of times a request will
be forwarded to a neighbor gatekeeper or proxy (see
the Hop counts
field specifies the hop count to use when sending a
search request to this particular zone.
Connection credentials section:
Username Traversal clients must always authenticate with
and Password traversal servers by providing their authentication
credentials. Each traversal client zone must specify a
Username and Password to be used for
authentication with the traversal server.
H.323 section:
Mode Determines whether H.323 calls are allowed to and
from the traversal server.
Protocol Determines which of the two firewall traversal
protocols (Assent or H.460.18) to use for calls to the
traversal server.
Cisco VCS Administrator Guide (X7.1)
traversal.
section for more information). This
Zones and neighbors
Usage tips
After a zone has been created, the Type
cannot be changed.
If the search request was received from
another zone and already has a hop
count assigned, the lower of the two
values is used.
Multiple traversal client zones can be
configured on a VCS, each with distinct
credentials, to connect to one or more
service providers.
See Firewall traversal protocols and
ports for more information.
Page 122 of 479