How to verify VAD of voip ?

From: JZ (jzhang0427a@xxxxxxxxx)
Date: Sat Mar 03 2001 - 00:51:53 GMT-3

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Hi, as hte cisco Doc. said, VAD can save BW in VoIP
netwoek. In a lab w/ two VoIP routers (c2600 and MC3810)
 phoneA---[c2600] =============[MC 3810]----phoneB
either applying "VAD" or "no VAD" on interfaces and then
turn on "deb ip pack detail ".

While make a call w/ or w/o vocie, the output of debug
shows no diference for the amount of packets
 "s= x.x.x.x, d=y.y.y.y"
 (x.x.x.x and y.y.y.y are the IP of IPv4:<ip address> )

Is there any way to verify the VAD affect ?
What about the "deb ip udp " or using sniffer , answer
machine ...?

Thanks,

Jim
Fri.

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