для Cisco Cisco IOS Software Release 12.4(2)XB6
DSP Voice Quality Metrics for MGCP
Prerequisites for DSP Voice Quality Metrics for MGCP
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Cisco Unified CallManager and Cisco IOS Interoperability Guide
Prerequisites for DSP Voice Quality Metrics for MGCP
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Both the source and destination routers must be running a Cisco IOS image with the Cisco IOS IP
Voice or higher grade feature package.
Voice or higher grade feature package.
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The source router must have a network module with a c5510 or c549 DSP. The destination router
need not have a network module with a DSP.
need not have a network module with a DSP.
Restrictions for DSP Voice Quality Metrics for MGCP
Note
Do not enable the DSP Voice Quality Metrics for MGCP feature on all media gateways associated with
a single Cisco PGW 2200 pair. Doing so can severely impact the call-processing ability of your system.
You can use the statistics control function in the feature to limit the impact on call processing.
a single Cisco PGW 2200 pair. Doing so can severely impact the call-processing ability of your system.
You can use the statistics control function in the feature to limit the impact on call processing.
Information About DSP Voice Quality Metrics for MGCP
Metrics for DSP performance on Media Gateway Control Protocol (MGCP) networks are useful for
maintaining service, tracking quality issues, and troubleshooting problems. Voice quality metrics on the
DSP can help you to evaluate the performance of your VoIP network.DSP metrics can be used to do the
following:
maintaining service, tracking quality issues, and troubleshooting problems. Voice quality metrics on the
DSP can help you to evaluate the performance of your VoIP network.DSP metrics can be used to do the
following:
•
Determine which calls have unacceptable voice quality and provide data on possible reasons for the
problem.
problem.
•
Determine the path taken by low-quality calls, including the network source (TDM or IP), endpoint
or midpoint equipment, or other call control processing problems.
or midpoint equipment, or other call control processing problems.
•
Collect call quality data for trend analysis.
Voice quality metrics for DSPs on MGCP networks can be gathered through the following methods:
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Voice-Quality Statistics in DLCX Messages
The DSP statistics gathering function on Cisco media gateways provides a way to trace an MGCP call
between a Cisco gatekeeper and the Cisco IOS gateway by including the MGCP call ID and the DS0 and
DSP channel ID in call-active and call-history records. These DSP statistics are sent as part of the MGCP
Delete Connection (DLCX) message. By correlating an MGCP call on the Cisco gatekeeper with the call
record on the gateway, additional statistics from the DSP can be understood and debugged for problems
related to voice quality. This feature also provides a method to limit the amount of statistics sent to the
Cisco gatekeeper to control the impact to call processing performance. The Support of DSP Voice
Quality Statistics feature gathers the DSP voice quality statistics on the Cisco gatekeeper.
between a Cisco gatekeeper and the Cisco IOS gateway by including the MGCP call ID and the DS0 and
DSP channel ID in call-active and call-history records. These DSP statistics are sent as part of the MGCP
Delete Connection (DLCX) message. By correlating an MGCP call on the Cisco gatekeeper with the call
record on the gateway, additional statistics from the DSP can be understood and debugged for problems
related to voice quality. This feature also provides a method to limit the amount of statistics sent to the
Cisco gatekeeper to control the impact to call processing performance. The Support of DSP Voice
Quality Statistics feature gathers the DSP voice quality statistics on the Cisco gatekeeper.