





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.