Cisco Cisco IOS Software Release 12.4(4)T

Both the source and destination routers must be running Cisco IOS Release 12.4(4)T or later 
releases.

Both the source and destination routers must be running a Cisco IOS image with the Cisco IOS 
IP Voice or higher grade feature package.

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.

The IP SLAs Responder must be enabled on the destination gateway.

The IP SLAs RTP-based VoIP operation gathers statistical information only from the DSP of the 
source router.

For source-to-destination measurements, the RTP-based VoIP operation does not obtain statistical 
information from DSPs.

Depending on the type of DSP, the statistics measured by the IP SLAs RTP-based VoIP operation 
will vary. For more information, see the 

.

The voice port used by the IP SLAs RTP-based VoIP operation will not be available for other calls.

To configure an IP SLAs RTP-based VoIP operation, you should understand the following concepts:

The IP SLAs RTP-Based VoIP Operation feature provides the following key benefits:

End-to-end performance measurements using DSPs for determining voice quality in VoIP networks.

Proactive threshold violation monitoring through Simple Network Management Protocol (SNMP) 
trap notifications and syslog messages.