Depends on how much latency.  The packetization of voice data (and associated 
digitizing, transcoding, etc) introduces some latency.  Smaller packet size can 
reduce this, but at the expense of needing more packets which eats up more CPU 
time, etc.  Also the jitter buffer size makes a significant difference.  For a 
PBX (LAN) application this can be quite small, as network processing is fairly 
predictable.  For stuff going over the internet it needs to be larger.

I have a small demo setup I'm experimenting with that only has a couple of SIP 
phones.  They are in the same room and the delay is was very annoying.  I made 
the jitter buffers smaller and it helped.  With good echo cancellation and more 
realistic physical separation this isn't really a problem.

If it is network based, you will see it on a ping.

Wilton
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