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P/N 480-0005-00-15 A-7
Appendix A: Getting Acquainted with Tenor CMS in the VoIP Network
Off Premises Exchange (OPX)
The Off Premises Extension (OPX) application is essentially an “add-on” to the Enterprise application. OPX
stands for Off-Premises Extension (or Exchange), which usually means that the phones (and/or fax machines)
terminate somewhere else other than where the PBX resides. The Intercom Dialing Feature enables you to
achieve this functionality for multiple extensions.
Several benefits to OPX include the following:
• Allows unlimited number of remote sites connectivity to an organization’s main phone network.
• Eliminates PSTN call charges within the network.
• Allows 4 digit dialing to all points throughout the network.
• Reduces the need for having a PBX at all sites.
• Central point of origination of Outbound PSTN calls.
Figure A-3 displays a scenario that will enable the people in the satellite office to be connected to the people in
the main building and to the “outside world”, even through their building does not have actual PSTN lines or a
resident PBX. In addition, the people located at headquarters can dial the people at the Remote site using a 4
digit Private Dial Plan.
Figure A-3 OPX Example
Remote Site
(OPX)
Headquarters
IP Network
PBX
PSTN
Analog Tenor
CMS
Remote Site
(OPX)
Headquarters
IP Network
PBX
PSTN
Analog Tenor
CMS