Cisco TelePresence Administrator's Manual page 152

Zones and neighbors
Setting Description
Automatically Determines what happens when the VCS receives an H.323 search,
respond to destined for this zone.
H.323
Off: an LRQ message is sent to the zone.
searches
On: searches are responded to automatically, without being forwarded to
the zone.
H.323 call Specifies the port on the neighbor to be used for H.323 calls to and from
signaling port this VCS.
This setting only applies if Automatically respond to H.323 searches is
On (which includes when the Infrastructure device profile is selected), as
the search process normally identifies which call signaling port to use.
Automatically Determines what happens when the VCS receives a SIP search that
respond to originated as an H.323 search.
SIP searches
Off: a SIP OPTIONS or SIP INFO message is sent.
On: searches are responded to automatically, without being forwarded.
This should normally be left as the default Off. However, some systems do
not accept SIP OPTIONS messages, so for these zones it must be set to
On. If you change this to On, you must also configure pattern matches to
ensure that only those searches that actually match endpoints in this zone
are responded to. If you do not, the search will not continue to other lower-
priority zones, and the call will be forwarded to this zone even if it cannot
support it.
Send empty Determines whether the VCS generates a SIP INVITE message with no
INVITE for SDP to send via this zone. INVITES with no SDP mean that the destination
interworked device is asked to initiate the codec selection, and are used when the call
calls has been interworked locally from H.323.
On: SIP INVITEs with no SDP are generated.
Off: SIP INVITEs are generated and a pre-configured SDP is inserted
before the INVITEs are sent.
In most cases this option should normally be left as the default On.
However, some devices do not accept invites with no SDP, so for these
zones this should be set to Off.
Note that the settings for the pre-configured SDP are configurable via the
CLI using the xConfiguration Zones Zone [1..1000]
[Neighbor/DNS] Interworking SIP commands. They should only be
changed on the advice of Cisco customer support.
SIP poison On: SIP requests sent to systems located via this zone are "poisoned" such
mode that if they are received by this VCS again they will be rejected.
Off: SIP requests sent out via this zone that are received by this VCS again
will not be rejected; they will be processed as normal.
Cisco VCS Administrator Guide (X8.1.1)
Configuring zones
Default Zone
types
Off Neighbor
1720 Neighbor
Off Neighbor
DNS
On Neighbor
DNS
Off Neighbor
Traversal
client
Traversal
server
DNS
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