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 will be taken to the

Locally Registered

Endpoints

page.

xConfiguration Zones LocalZone

•

Traversal H323

H.323 Assent mode

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

H.460.18 mode

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

H.460.19 demux mode

Determines whether the VCS Expressway will
operate in Demultiplexing mode for calls from
locally registered endpoints.

: 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 will send a UDP
probe to the VCS Expressway.

UDP probe keep alive interval

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

UDP probe retry count

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

TCP probe retry interval

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

TCP probe keep alive interval

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

TCP probe retry count

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

Save

Click here to save your settings.