Polycom WX 1500 User Manual page 148

Polycom VVX 1500 Business Media Phone User Guide
 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.
Connection of this Polycom VVX 1500 VoIP Video Telephone to the Telecom
network
All samples of this Polycom VVX 1500 VoIP Video Telephone connected to the Telecom network must be
modified as described in KTL Test Report number 8A1710ANZ1 failure to do so will lead to the
cancellation of this Telepermit.
UAE
TRA Registered No: 0017802/09
Dealer No: 0017133/09
Polycom, Inc.
Version 5.0.0
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