reply to PSWired
Re: nbar missing some RTP traffic? Big DUH! here...
No guarantee the voice traffic associated with a particular stream is going to exit through the particular edge router that's accepting the incoming packets. That breaks the above method.
Back to the drawing board. Ideas? Surely I'm not the first one to run into this problem.
you might want to check your buffers... I believe you are dropping packets... when you can use the ACL without issues and have trouble with Class-maps this maybe due to buffer in the router...
check the sh buffers and look for the misses... The tuning of the buffers may solve your issue.