Determines which of the two firewall traversal
protocols will be used for calls through the
firewall, to and from the client. The same
protocol must be used by the client.

SIP mode

Determines whether SIP calls will be allowed to
and from the traversal client.

SIP port

Specifies the port on the VCS Expressway to
be used for SIP calls from the traversal client.

SIP transport

Determines which transport type will be used
for SIP calls to and from the traversal client.

Client authentication username

If the traversal client is a VCS, this must be the
VCS’s Authentication Username.
You must also add the client’s Authentication
username and password to the VCS’s
authentication database. To go directly to the
page where you can do this, click on the

Add/

Edit Local Authentication Database

link.

H.460.19 demux mode
On

: allows use of the same two ports for media

for all calls from the traversal client.

Off

: each call from the traversal client will use

a separate pair of ports for media.

TCP keep alive interval

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

TCP retry count

Sets the number of times the traversal client
will attempt to send a TCP probe to the VCS
Expressway.

TCP retry interval

Sets the frequency (in seconds ) with which
the traversal client will send a TCP probe to the
VCS Expressway.

UDP keep alive interval

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

UDP retry count

Sets the number of times the traversal client
will attempt to send a UDP probe to the VCS
Expressway.

UDP retry interval

Sets the interval (in seconds) with which the
traversal client will send a UDP probe to the
VCS Expressway.