Configuring Expressway And Traversal Endpoint Communications - Cisco TelePresence Administrator's Manual

Firewall traversal
Configuring Expressway and traversal endpoint
communications
Traversal-enabled H.323 endpoints can register directly with the VCS Expressway and use it for firewall
traversal.
The Locally registered endpoints
allows you to configure the way in which the VCS Expressway and traversal-enabled endpoints
communicate.
The options available are:
Field Description
H.323 Assent Determines whether or not H.323 calls using Assent mode for firewall traversal are allowed.
mode
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 Determines whether the VCS Expressway operates in demultiplexing mode for calls from
demux mode locally registered endpoints.
On: uses the media demultiplexing ports for all calls.
Off: each call uses a separate pair of ports for media.
H.323 Determines which protocol the VCS Expressway uses if an endpoint supports both Assent and
preference H.460.18.
UDP probe The frequency (in seconds) with which locally registered endpoints send a UDP probe to the
retry interval VCS Expressway.
UDP probe The number of times locally registered endpoints attempt to send a UDP probe to the VCS
retry count Expressway.
UDP probe The interval (in seconds) with which locally registered endpoints send a UDP probe to the VCS
keep alive Expressway after a call is established, in order to keep the firewall's NAT bindings open.
interval
TCP probe The frequency (in seconds) with which locally registered endpoints send a TCP probe to the
retry interval VCS Expressway.
TCP probe The number of times locally registered endpoints attempt to send a TCP probe to the VCS
retry count Expressway.
TCP probe The interval (in seconds) with which locally registered endpoints send a TCP probe to the VCS
keep alive Expressway after a call is established, in order to keep the firewall's NAT bindings open.
interval
Cisco VCS Administrator Guide (X8.1.1)

Configuring Expressway and traversal endpoint communications

page (Configuration > Traversal > Locally registered endpoints)
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