Avaya 1692 User Manual page 31

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.
This Avaya 1692 IP Handsfree Conference Telephone Telepermit
The above named product has been Telepermitted on the understanding that it is electrically
identical in the network terminating part of its electronic circuitry to the "Polycom SoundStation
IP6000 Handsfree VoIP Conference Telephone" Telepermitted on PTC216/09/012. Telecom
Access Standards reserves the right to cancel this Telepermit if this information is proven
incorrect.
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1692 IP Conference Phone User's Guide July 2009