Table Of Contents
IP SLAs—Analyzing VoIP Service Levels Using the Gatekeeper Registration Delay Operation
Restrictions for the IP SLAs VoIP Gatekeeper Registration Delay Operation
Information About the IP SLAs VoIP Gatekeeper Registration Delay Operation
H.323, Gatekeepers, and Gateways
Gateway-to-Gatekeeper Registration Delay Time Monitoring
How to Configure the IP SLAs VoIP Gatekeeper Registration Delay Operation
Configuring the VoIP H.323 Gateway
Configuring and Scheduling the IP SLAs VoIP Gatekeeper Registration Delay Operation
Configuration Examples for the IP SLAs VoIP Gatekeeper Registration Delay Operation
Configuring the IP SLAs VoIP gatekeeper registration delay operation: Example
Feature Information for the IP SLAs VoIP Gatekeeper Registration Delay Operation
IP SLAs—Analyzing VoIP Service Levels Using the Gatekeeper Registration Delay Operation
First Published: August 14, 2006Last Updated: July 31, 2008This document describes how to use the Cisco IOS IP Service Level Agreements (SLAs) VoIP gatekeeper registration delay operation to determine the average, median, or aggregated response time (delay) of registration attempts from a Voice over IP (VoIP) gateway to a VoIP gatekeeper device.
To measure VoIP gatekeeper registration response time, the gatekeeper registration delay operation functions by sending a lightweight Registration Request (RRQ) from an H.323 gateway (GW) to an H.323 gatekeeper (GK), and recording the amount of time taken to receive the Registration Confirmation (RCF) back from the gatekeeper.
Finding Feature Information in This Module
Your Cisco IOS software release may not support all of the features documented in this module. To reach links to specific feature documentation in this module and to see a list of the releases in which each feature is supported, use the "Feature Information for the IP SLAs VoIP Gatekeeper Registration Delay Operation" section.
Finding Support Information for Platforms and Cisco IOS and Catalyst OS Software Images
Use Cisco Feature Navigator to find information about platform support and Cisco IOS and Catalyst OS software image support. To access Cisco Feature Navigator, go to http://www.cisco.com/go/cfn. An account on Cisco.com is not required.
Contents
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Restrictions for the IP SLAs VoIP Gatekeeper Registration Delay Operation
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Restrictions for the IP SLAs VoIP Gatekeeper Registration Delay Operation
You cannot configure the IP SLAs VoIP gatekeeper registration delay operation if the gatekeeper has already been registered with the gateway.
Information About the IP SLAs VoIP Gatekeeper Registration Delay Operation
To configure the IP SLAs VoIP gateway registration delay operation, you should understand the following concepts:
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H.323, Gatekeepers, and Gateways
H.232 is the ITU-T protocol standard used for managing and facilitating packetized voice and video over local-area networks (LANs, particularly intranets) and over the Internet. H.323 consists of several component standards; see the "Glossary" section for details on these standardized protocols.
H.323 is considered an "umbrella protocol" because it defines all aspects of call transmission, from call establishment to capabilities exchange to network resource availability. H.323 defines Registration, Admission, and Status (RAS) protocols for call routing, H.225 protocols for call setup, and H.245 protocols for capabilities exchange. The IP SLAs VoIP Gatekeeper Registration Delay Monitoring feature focuses on the function of the call control H.323 stack.
For an in-depth discussion of H.323, including gatekeeper and gateway functionality, see the "H.323 Applications" chapter (part of the Cisco IOS Voice, Video, and Fax Configuration Guide, Release 12.2) [ http://www.cisco.com/univercd/cc/td/doc/product/software/ios122/122cgcr/fvvfax_c/index.htm ].
Gateway-to-Gatekeeper Registration Delay Time Monitoring
The IP SLAs VoIP gatekeeper registration delay operation provides statistical data on the amount of time taken to register a gateway to a gatekeeper. IP SLAs was designed to gather information over time, at intervals you specify, so that statistics can be provided on key metrics often used in Service Level Agreements (SLAs). Aggregated totals, median, or average data can be viewed using the Cisco IOS command-line interface (CLI) on the device running IP SLAs, or retrieved from the device by external applications using SNMP.
Cisco IOS IP SLAs also provides notification options based on performance thresholds and reaction triggering. These notification options allow for proactive monitoring in an environment where IT departments can be alerted to potential network problems, rather than having to manually examine data.
For further information on these functions, see the Cisco IOS IP SLAs Monitoring Technology Configuration Guide.
This operation will measure time from when the RRQ message is sent and when RCF message is received. A timeout may be required if a response is not received in a certain timeframe.
How to Configure the IP SLAs VoIP Gatekeeper Registration Delay Operation
This section contains the following procedures:
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Configuring the VoIP H.323 Gateway
Check the registration status of the gateway to a gatekeeper using the show gateway command. If the gateway is not registered, perform the task described in this section.
Prerequisites
Prior to configuring the IP SLAs VoIP gatekeeper registration delay operation, the gatekeeper must be enabled and the gateway must be preregistered. As a best practice, you should confirm the gatekeeper and gateway status first.
If the gateway is not registered, select an interface and configure the gatekeeper in the gateway.
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DETAILED STEPS
Examples
Use the show gateway command to verify the registration status of the gateway to a gatekeeper.
The following example shows sample output from the show gateway command if the gateway (named GW3) is registered to a gatekeeper (named slagk):
Router# show gatewayH.323 ITU-T Version: 4.0 H323 Stack Version: 0.1H.323 service is upGateway GW3 is registered to Gatekeeper slagkAlias list (CLI configured)E164-ID 2073418E164-ID 5251212H323-ID GW3Alias list (last RCF)E164-ID 2073418E164-ID 5251212H323-ID GW3H323 resource thresholding is DisabledThe following example shows sample output for the show gateway command if the gateway is not registered to a gatekeeper:
Router# show gatewayGateway gw3 is not registered to any gatekeeperAlias list (CLI configured)E164-ID 2073418E164-ID 5251212H323-ID gw3/wwAlias list (last RCF)H323 resource thresholding is DisabledUse the show gatekeeper endpoint command to verify the endpoint's registration status to the gatekeeper. The following example shows the common output of this command if an endpoint is registered:
Router# show gatekeeper endpointGATEKEEPER ENDPOINT REGISTRATION================================CallSignalAddr Port RASSignalAddr Port Zone Name Type Flags-------------- ----- ------------- ---- --------- ---- -----172.16.13.35 1720 172.16.13.35 50890 gk VOIP-GWE164-ID: 2073418E164-ID: 5251212H323-ID: gw3Total number of active registrations = 1The following example shows the common output of the show gatekeeper endpoint command if an endpoint is not registered:
Router# show gatekeeper endpointGATEKEEPER ENDPOINT REGISTRATION================================CallSignalAddr Port RASSignalAddr Port Zone Name Type Flags-------------- ----- ------------- ---- --------- ---- -----Total number of active registrations = 0The following configuration example shows a properly configured gateway:
gatewayinterface Ethernet1/1ip address 172.29.129.123 255.255.255.0h323-gateway voip interfaceh323-gateway voip id zone1 ipaddr 172.29.129.124 1719h323-gateway voip id saagk ipaddr 172.29.129.28 1719h323-gateway voip h323-id GWZTroubleshooting Tips
If there appears to be registration issues, see the Troubleshooting Gatekeeper Registration Issues technical assistance document for suggestions on resolving the issue.
http://www.cisco.com/warp/public/788/voip/gk-reg-issues.html
What to Do Next
Configure and schedule the IP SLAs VoIP gatekeeper registration delay operation.
Configuring and Scheduling the IP SLAs VoIP Gatekeeper Registration Delay Operation
Perform this task to begin gathering IP SLAs VoIP gatekeeper registration delay data.
Prerequisites
Prior to configuring the IP SLAs VoIP gatekeeper registration delay operation, the gatekeeper must be enabled and the gateway must be preregistered. As a best practice, you should confirm the gatekeeper and gateway status first.
If the gateway is not registered, select an interface and configure the gatekeeper in the gateway.
SUMMARY STEPS
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DETAILED STEPS
Troubleshooting Tips
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What to Do Next
To view and interpret the results of an IP SLAs operation use the show ip sla statistics command. Checking the output for fields that correspond to criteria in your service level agreement will help you determine whether the service metrics are acceptable.
Configuration Examples for the IP SLAs VoIP Gatekeeper Registration Delay Operation
This section contains the following configuration example:
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Configuring the IP SLAs VoIP gatekeeper registration delay operation: Example
In the following example, a VoIP gatekeeper registration delay operation is configured and scheduled to start immediately. This example assumes the gateway to gatekeeper relationship has already been configured.
Router# configure terminalRouter(config)# ip sla 1Router(config-ip-sla)# voip delay gatekeeper-registrationRouter(config-ip-sla-voip)# exitRouter(config)# ip sla schedule 1 start-time now life foreverWhere to Go Next
For information about other types of IP SLAs operations and IP SLAs features, see the Cisco IOS IP SLAs Features Roadmap.
Additional References
The following sections provide references related to the IP SLAs VoIP gatekeeper registration delay operation.
Related Documents
Cisco IOS IP SLAs command-line interface enhancements
Cisco IOS IP Service Level Agreements Command Line Interface, Cisco white paper
Cisco IOS IP SLAs commands
Gateway and gatekeeper configuration using Cisco IOS Release 12.3 and later releases
Cisco IOS Voice Configuration Library
Troubleshooting gatekeeper configurations
Troubleshooting Gatekeeper Registration Issues (Tech Note document)
http://www.cisco.com/en/US/tech/tk1077/technologies_tech_note09186a008011221e.shtml
Standards
No new or modified standards are supported by this feature, and support for existing standards has not been modified by this feature.
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MIBs
CISCO-RTTMON-MIB
To locate and download MIBs for selected platforms, Cisco IOS releases, and feature sets, use Cisco MIB Locator found at the following URL:
RFCs
No new or modified RFCs are supported by this feature, and support for existing RFCs has not been modified by this feature.
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Technical Assistance
Glossary
Gatekeepers—Network devices that help to facilitate and control H.323-based voice and video communications across networks. Gatekeepers are responsible for providing address translation between LAN aliases and IP addresses, call control and routing services to H.323 endpoints, system management, and security policies. These services provided by the gatekeeper in communicating between H.323 endpoints are defined in RAS.
Gateways—Network devices that provide translation between circuit-switched networks (particularly, H.320 ISDN) and packet-based networks (for example, H.323 LANs), allowing endpoints in networks with different transmission formats, codecs, and protocols to communicate.
H.225.0—Protocol standard that defines the establishment and disconnection of H.323 calls.
H.225.0 RAS—H.225.0 Registration/Admission/Status. Standard that facilitates communication between H.323 gateways (endpoints) and H.323 gatekeepers.
H.235—Protocol standard that defines security solutions for H.323 protocols (Q.931, H.245, RAS, Streams). H.235 was formerly called H.SECURE.
H.245—Protocol standard that defines connection management and negotiation capabilities between H.323 devices on the network once the call is established by Q.931.
H.323—An ITU protocol standard for the transmission of real-time audio (Voice/VoIP), video (for example, videoconferencing), and data information over packet switching-based networks. Such networks include IP-based (including the Internet) networks, Internet packet exchange-based local-area networks (LANs), enterprise networks and metropolitan and wide-area networks (WANs). H.323 can also be applied to multipoint multimedia communications. H.323 defines a distributed architecture for IP telephony applications, including multimedia, video conferencing, video over the Internet, and VoIP.
Q.931—Protocol standard that defines the establishment and disconnection of H.323 calls.
RTP/RTCP—Real-time Protocol/Real-Time Control Protocol serves as the standardized means for transmitting and receiving audio and video streams across the network once the call is established.
VoIP—Voice or Video over Internet Protocol. Sometimes used to refer to all IP telephony applications.
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Feature Information for the IP SLAs VoIP Gatekeeper Registration Delay Operation
Table 1 lists the release history for this feature.
Not all commands may be available in your Cisco IOS software release. For release information about a specific command, see the command reference documentation.
Use Cisco Feature Navigator to find information about platform support and software image support. Cisco Feature Navigator enables you to determine which Cisco IOS and Catalyst OS software images support a specific software release, feature set, or platform. To access Cisco Feature Navigator, go to http://www.cisco.com/go/cfn. An account on Cisco.com is not required.
Note
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