Cisco TelePresence Administrator's Manual page 139

Field Description
Accept Controls whether proxied SIP registrations routed
proxied through this zone are accepted.
registrations
Media Controls the media encryption policy applied by the
encryption VCS for SIP calls (including interworked calls) to and
mode from this zone.
Poison mode Determines if SIP requests sent to systems located
via this zone are "poisoned" such that if they are
received by this VCS again they will be rejected.
Authentication section:
Authentication Controls how the VCS authenticates incoming
policy messages from this zone and whether they are
subsequently treated as authenticated,
unauthenticated, or are rejected. The behavior varies
for H.323 messages, SIP messages that originate
from a local domain and SIP messages that originate
from non-local domains.
UDP / TCP probes section:
UDP retry The frequency (in seconds) with which the client
interval sends a UDP probe to the VCS Expressway if a keep
alive confirmation has not been received.
UDP retry The number of times the client attempts to send a
count UDP probe to the VCS Expressway during call setup.
UDP keep The interval (in seconds) with which the client sends
alive interval a UDP probe to the VCS Expressway after a call is
established, in order to keep the firewall's NAT
bindings open.
TCP retry The interval (in seconds) with which the traversal
interval client sends a TCP probe to the VCS Expressway if a
keep alive confirmation has not been received.
TCP retry The number of times the client attempts to send a
count TCP probe to the VCS Expressway during call setup.
TCP keep The interval (in seconds) with which the traversal
alive interval client sends a TCP probe to the VCS Expressway
when a call is in place, in order to maintain the
firewall's NAT bindings.
Cisco VCS Administrator Guide (X7.2)
Zones and neighbors
Usage tips
This setting only applies to registration
requests for a domain for which the VCS
is acting as a Registrar. For requests for
other domains the SIP Registration
Proxy Mode setting applies. See
Proxying registration requests
information.
See Media encryption policy
information.
See Authentication policy configuration
options for more information.
The default UDP and TCP probe retry
intervals are suitable for most situations.
However, if you experience problems
with NAT bindings timing out, they may
need to be changed.
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