I personally have performed 'real time test" of plugging a Cisco 7940 phone behind a Netgear router and had is sound like "butt-crack".
and then plugged it in (within 2 min) behind a Cisco router, and it was Crystal Clear!
 
ROUTING GEAR IS ALWAYS THE KEY TO VOICE QUALITY ON VOIP.
 
That and a phone that has an embedded DSP chip vs. software driven.
 
Hence
 
GrandStream sucks
and Polycom and Cisco kick butt behind the proper routing gear!
 
Brad
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