Most of the following open source PBX vendors were on hand at Digium Asterisk ... whether they want to leverage PSTN protocols like ISDN, SS7 or CAS or provide rich applications around voice ...

By bridging the gap between the technology designed for the PSTN (Public Switched Telephone ... RingCentral supports a hybrid-PBX deployment that allows internal dialing between employees using ...

Snom PBX pricing varies depending on the hardware communications options. Calls can be made over plain-old telephone service (POTS) analog lines through PSTN gateways, or digitally over ISDN ...

A telephone service in which an IP-based PBX is located in the telephone ... as well as connectivity to the regular telephone system (PSTN). See CENTREX and hosted VoIP. THIS DEFINITION IS FOR ...