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VoIP end-to-end delay

The processing, queuing, serialization, and propagation delays are types of delay that make up end-to-end delay. My question is how do I measure each of those delays? My users are experiencing performance issue with VoIP and I'd like to break it down so that I can see which delay may be the cause of the poor performance.

My environment is all Cisco switches and routers. We have site-to-site VPN connections.

2 Solutions
The Cisco article , "Measuring Delay, Jitter, and Packet Loss with Cisco IOS SAA and RTTMON" may be of direct help or provide you with ideas. It's available at:

http://www.cisco.com/c/en/us/support/docs/availability/high-availability/24121-saa.html >
leblancAccountingAuthor Commented:
Cisco IOS SAA and RTTMON sounds interesting. I've never used it before. So I'd like to get some inputs from you the experts.

Also, my equipment does not have IOS 12.05T or higher.

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