ZyXEL Communications ISG50-ISDN Application Note page 121

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Click the button to view RTCP information for each call.
Recommended value of RTCP for good quality:
loss < 1% (If packet loss > 3%, call quality will degrade audibly.)
Jitter < 10 ms. (The meaning of the jitter value depends greatly on the jitter buffers involved.)
rtt < 150 ms (RTT = delays of both directions added)
121

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