Cisco Cisco IOS Software Release 12.2(15)T Entwickleranleitung
C H A P T E R
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Cisco Gatekeeper External Interface Reference, Version 4.2
Cisco IOS Release 12.2(15)T
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Overview of the Cisco IOS Gatekeeper
This chapter describes the main functions of a gatekeeper and includes the following sections:
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Cisco offers a Voice over IP gatekeeper called the Multimedia Conference Manager, which is an
H.323-compliant program implemented as part of the Cisco IOS software. The Multimedia Conference
Manager software can run on Cisco 2500 series, Cisco 2600 series, Cisco 3600 series, and
Cisco MC3810 Multiservice Access Concentrators.
H.323-compliant program implemented as part of the Cisco IOS software. The Multimedia Conference
Manager software can run on Cisco 2500 series, Cisco 2600 series, Cisco 3600 series, and
Cisco MC3810 Multiservice Access Concentrators.
Zone and Subnet Configuration
A zone is defined as the set of H.323 nodes controlled by a single gatekeeper. Gatekeepers co-existing
on a network can be configured so that they register endpoints from different subnets.
on a network can be configured so that they register endpoints from different subnets.
Endpoints attempt to discover a gatekeeper, and consequently what zone they are members of, using the
RAS message protocol. The protocol supports a discovery message that can be sent multicast or unicast.
RAS message protocol. The protocol supports a discovery message that can be sent multicast or unicast.
If the message is sent multicast, the endpoint registers nondeterministically with the first gatekeeper to
respond. Any endpoint on a subnet that is not enabled for the gatekeeper is not accepted as a member of
that gatekeeper’s zone. If the gatekeeper receives a discovery message from such an endpoint, it sends
an explicit reject message.
respond. Any endpoint on a subnet that is not enabled for the gatekeeper is not accepted as a member of
that gatekeeper’s zone. If the gatekeeper receives a discovery message from such an endpoint, it sends
an explicit reject message.
Terminal Name Registration
Gatekeepers recognize one of the following types of terminal aliases, or terminal names:
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H.323 identifiers (IDs), which are arbitrary, case-sensitive text strings.
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E.164 addresses, which are telephone numbers.
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E-mail IDs.