Safety and Compliance (continued)

New Zealand Telepermit (continued)

Echo Cancellation

Echo cancellers are not normally required in the Telecom PSTN because geographic delays are acceptable where CPE return loss is maintained within Telepermit limits. However, those private networks making use of Voice over IP technology are required to provide echo cancellation for all voice calls. The combined effect of audio / VoIP conversion delay and IP routing delay can cause the echo cancellation time of 64 mS to be required.

1692 IP Conference Phone User’s Guide

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Avaya 1692 IP manual IP Conference Phone User’s Guide Nov 2009