What is Required to Use the VoIP Feature

The following are required in order to use VoIP:

• The Passport units at both ends of the call must have voice modules installed.
• The Passport units at both ends of the call must have software Release 4.0 or newer.
• The Passport units at both ends of the call must have reachable IP addresses.
• NAC/NAS dialing (call address resolution) must be used. RSI/RSA dialing does not support VoIP operation.