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Configuring H.323 Gatekeepers and Proxies
H.323 Gatekeeper Configuration Examples
VC-350
Cisco IOS Voice, Video, and Fax Configuration Guide
Note The no shut command is issued on both gatekeepers, primary and secondary. If the show gatekeeper
status command is issued on the two gatekeepers, gk1 will show the following:
Gatekeeper State: UP
But gk2 will show the following:
Gatekeeper State: HSRP STANDBY
Using ASR for a Separate Multimedia Backbone Example
The examples in this section illustrate a separate multimedia backbone network dedicated to transporting
only H.323 traffic. The closed functionality of the H.323 proxy is necessary for creating this type of
backbone. Place a closed H.323 proxy on each edge of the multimedia backbone to achieve the following
goals:
• The proxy directs all inter-proxy H.323 traffic, including Q.931 signaling, H.245, and media stream,
to the multimedia backbone.
• The proxy shields the multimedia backbone so that routers on edge networks and other backbone
networks are not aware of its existence. In this way, only H.323-compliant packets can access or
traverse the multimedia backbone.
• The proxy drops any unintended non-H.323 packets that attempt to access the multimedia backbone.
This section contains the following subsections:
• Enabling the Proxy to Forward H.323 Packets, page 351
• Isolating the Multimedia Network, page 351
• Configuring a Co-Edge Proxy with ASR Without Subnetting Example, page 352
• Co-Edge Proxy with Subnetting Example, page 354
• Configuring an Inside-Edge Proxy with ASR Without Subnetting Example, page 356
• Configuring a QoS-Enforced Open Proxy Using RSVP Example, page 357
• Configuring a Closed Co-Edge Proxy with ASR Without Subnetting Example, page 359
Figure 62 illustrates a network that has a multimedia backbone. A gatekeeper (not shown) in the edge
network (zone) directs all out-of-zone H.323 calls to the closed proxy on the edge of that network. The
closed proxy forwards this traffic to the remote zone through the multimedia backbone. A closed proxy
and the edge router may reside in the same Cisco router, or they may be in separate routers, as shown in
Figure 62.
Figure 62 Sample Network with Multimedia Backbone
EP1
Data backbone
Multimedia
backbone
Edge net 1
Edge net 2
11391
EP2
PX2
R2
PX1
R1