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Field
H.323 Settings
Gatekeeper call mode
Accept H.323 neighbor requests
only from specified external
gatekeepers
Resolve H.323 Email-ID dial
strings to other registered H.323
aliases
Automatically assign enterprise
users' email addresses as H.323
email IDs
Location request hop count
Location request timeout
(seconds)
IRQ sending interval (seconds)
Terminate calls based on failed
responses to IRQs
Dynamically blacklist signaling
from hyperactive endpoints
Polycom, Inc.
Description
Direct call mode — The Call Server processes only H.225.0 RAS call control
messages. The endpoints exchange other call signaling and media control
messages directly, bypassing the gatekeeper.
Routed call mode — The Call Server proxies all H.323 signaling messages.
If this option is selected, the Call Server accepts H.323 location requests
(LRQs) only from gatekeepers configured on the External Gatekeeper page
(see
External
Gatekeeper).
If this option is selected, the Call Server resolves email ID dial strings to
another local alias by using the user part of the email address. For example,
the dial string 1234@mycompany.com would resolve to the endpoint
registered as 1234.
If this option is selected and the system is integrated with Active Directory, an
endpoint associated with an enterprise user is assigned the user's email
address (if that address hasn't already been explicitly assigned to another
endpoint).
The initial hop count the Call Server uses when it sends LRQs to neighbored
gatekeepers.
The number of seconds to wait for a response from a neighbored gatekeeper.
The interval at which the system sends IRQ messages to H.323 endpoints in
a call, requesting QoS (quality of service) reports.
Must be in the range 10-600.
If this option is selected, the Call Server terminates a call if it sends an IRQ
(Information Request) to an endpoint that signaled support for IRQs, and the
endpoint either fails to respond or responds with an IRR (Information Request
Response) containing an invalidCall field. This is the correct behavior
according to the H.323 ITU Specification, and it prevents a call license from
being used unnecessarily for a call that's no longer active.
Some endpoints (VVX prior to v.4.0.1; Sony PCS1, XG80, and G70; and
possibly others) signal support for IRQs but don't properly handle IRQ/IRR
messaging, causing active calls to be disconnected if this option is selected.
To avoid this problem with such endpoints, leave this option off.
Note: This setting has no effect on calls from endpoints that don't signal
support for IRQs.
If this option is selected, the Call Server adds H.323 endpoints to its blacklist
(ignoring their signaling messages) when they send duplicate RRQ or GRQ
messages in excess of the criteria you specify below.
When an endpoint is blacklisted, the Call Server:
•
Stops interpreting, responding to, auditing, or logging messages of that
type from the endpoint.
•
Creates
Alert 5002
and corresponding SNMP trap.
•
Logs the blacklisting.
Call Server Configuration
237
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