Nortel BCM50 Installation And Configuration Manual page 23

This delaying of packets can provide somewhat of a communications challenge, because speech is
delayed by the number of frames in the buffer. For one-sided conversations, there are no issues.
However, for two-sided conversations, where one party tries to interrupt the other speaking party,
by the time the voice of the interrupter reaches the interruptee, the interruptee has spoken (2*jitter
size) frames past the intended point of interruption. In cases where very large jitter sizes are used,
some users revert to saying OVER when they wish the other party to speak.
Possible jitter buffer settings and corresponding voice packet latency (delay) for the BCM50
system IP telephones are:
• None
• Small (G.711/G.729: 0.06 seconds)
• Medium (G711/G.729: 0.12 seconds)
• Large (G711/G.729: 0.18 seconds)
Chapter 2 IP telephone overview
BCM50 IP Telephone Installation and Configuration Guide
23