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Cisco IOS H.323 Configuration Guide
Release 12.4
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Cisco IOS H.323 Configuration Guide
© 2009 Cisco Systems, Inc. All rights reserved.
Cisco IOS H.323 Feature Roadmap
This guide collects together in one place information about Cisco IOS voice features having to do with
the H.323 standard for sending and receiving audio, video, and data on an IP-based internetwork.
This first chapter of the guide is a feature roadmap. It describes how to access Cisco Feature Navigator
and lists H.323 features by Cisco IOS release.
Note
For information about the full set of Cisco IOS voice features, see the entire Cisco IOS Voice
Configuration Library—including library preface, glossary, and other documents—at
http://www.cisco.com/univercd/cc/td/doc/product/software/ios124/124tcg/vcl.htm .
Platforms and Cisco IOS Software Images
Use Cisco Feature Navigator to find information about platform support and Cisco IOS software image
support. Access Cisco Feature Navigator at http://www.cisco.com/go/fn . You must have an account on
Cisco.com. If you do not have an account or have forgotten your username or password, click Cancel at
the login dialog box and follow the instructions that appear.
Americas Headquarters:
Cisco Systems, Inc., 170 West Tasman Drive, San Jose, CA 95134-1706 USA
© 2009 Cisco Systems, Inc. All rights reserved.
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Cisco IOS H.323 Feature Roadmap
Cisco IOS H.323 Feature List
Cisco IOS H.323 Feature List
Table 1 lists H.323 features by Cisco IOS release. Features that are introduced in a particular release are
available in that and subsequent releases.
Ta b l e 1
H.323 Features by Cisco IOS Release
Release
Features Introduced 1
Feature Description
Feature Documentation
12.4(4)XC
H.323 VoIP Call Preservation
Enhancements for WAN Link Failures
Sustains connectivity for H.323
topologies where signaling is handled
by an entity that is different from the
other endpoint,
“Configuring H.323
Gateways” on page 41 of this
guide
12.4(4)T
No Retry on User Busy in an H.323
Gateway
Changes the default behavior of the
gateway to not retry alternate
endpoints when the release complete
reason is user busy.
“Configuring No Retry on User
Busy in an H.323 Gateway”
section on page 91 of this
guide
12.3(11)T
Overlap Signaling on H.323
Terminating Gateways
Introduces overlap signaling.
“Configuring a Cisco
Multiservice IP-to-IP
Gateway” c hapter of the Cisco
Multiservice IP-to-IP Gateway
Configuration Guide
12.3(7)T
Signal ISDN B-Channel ID to Enable
Application Control of Voice Gateway
Trunks
Enables the H.323 gateway to access
B-channel information for all H.323
calls.
“Configuring H.323
Gateways” on page 41 of this
guide
12.3(1)
Gatekeeper Enhancements for
Managed Voice Services
Adds call control based on available
bandwidth and endpoint resources,
allowing call rerouting to achieve
higher call-completion rates and
ensure QoS.
“Configuring H.323
Gatekeepers and Proxies” on
page 137 of this guide
12.3(1) cont. Gateway Codec Order Preservation
and Shutdown Control
Adds a way to shutdown and restart
SIP and H.323 gateways.
“Configuring H.323
Gateways” on page 41 of this
guide
12.2(15)T
Gatekeeper Management Statistics
Provides statistics that can be used to
monitor a network and troubleshoot
network problems.
“Basic H.323 Setup and
Management” on page 23 of
this guide
H.323v4 Gateway Zone Prefix
Registration Enhancements
Reduces configuration complexity on
the gatekeeper by enabling a gateway
to report supported E.164 prefixes to
the gatekeeper at registration.
“Configuring H.323
Gateways” on page 41 of this
guide
Tokenless Call Authorization
Creates a trusted access list to handle
networks that have not implemented
token-security features.
“Configuring H.323
Gatekeepers and Proxies” on
page 137 of this guide
12.2(13)T
Multiservice IP-to-IP Gateway with
Media Flow-Around
Adds media flow-around capability to
the multiservice IP-to-IP gateway.
Cisco Multiservice IP-to-IP
Gateway Application Guide
Cisco IOS H.323 Configuration Guide
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Cisco IOS H.323 Feature Roadmap
Cisco IOS H.323 Feature List
Table 1
H.323 Features by Cisco IOS Release (continued)
Release
Features Introduced 1
Feature Description
Feature Documentation
12.2(11)T
Basic Service Relationships (H.225
Annex-G)
Implements the minimal set of Annex
G features needed to allow Cisco
border elements to interoperate with
other border elements.
“Configuring H.323
Gateways” on page 41 of this
guide
Call Status Tracking Optimization
Reduces unnecessary messages
between gatekeeper and the gateways,
reducing network congestion and
CPU over-utilization.
“Configuring H.323
Gatekeepers and Proxies” on
page 137 of this guide
Configuring a Gatekeeper to Provide
Nonavailability Information for
Terminating Endpoints
Describes how to configure a
gatekeeper to provide nonavailability
information for terminating
endpoints.
“Configuring H.323
Gatekeepers and Proxies” on
page 137 of this guide
Gatekeeper Alias Registration and
Address Resolution Enhancements
Allows configuration of multiple
prefixes for a local zone and
registration of an endpoint belonging
to multiple zone prefixes.
“Configuring H.323
Gatekeepers and Proxies” on
page 137 of this guide
Gatekeeper Endpoint Control
Enhancements
Enable finer-grained control of
gatekeeper registrations, and enable
more capable and robust back-end
server applications.
“Configuring H.323
Gatekeepers and Proxies” on
page 137 of this guide
Gatekeeper-to-Gatekeeper
Authentication
Provides additional security for H.323
networks by introducing the ability to
validate intradomain and interdomain
gatekeeper-to-gatekeeper LRQ
messages on a per-hop basis. When
used in conjunction with per-call
security using IZCT, protects network
resources from attackers and prevents
security holes.
“Configuring H.323
Gatekeepers and Proxies” on
page 137 of this guide
Cisco IOS H.323 Configuration Guide
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