A full-duplex speakerphone (600) that is coupled to a network such as a public switched telephone network (502).

A system and a method for communicating information using the public switched telephone network and a wide area network.

The invention relates to implementing voting services and other corresponding telephone services via a public switched telephone network.

A virtual private network (31) includes an internet protocol (IP) network (47) and a public switched telephone network (PSTN) (37).

Finally, the system determines whether the established link (37) passes through a PSTN, and if so, transmits a 2100 hertz tone across the established link (37).

A telecommunications network (10) includes a public switched telephone network (12) and an Internet data network (14).

The apparatus may communicate with the activation center (30) via a data communication network or a public switched telephone network (40).

The telco interface (110) may be configured to provide access to users over a public switched telephone network (102).

In general, the invention relates to the implementation of voice service systems in a Public Switched Telephone Network.

Commencing a call phase dialog between the computing devices may be performed after the telephone call is established over the public switched telephone network.

The Public Switched Telephone Network (PSTN) uses these signals to send voice communication over the telephone network.

POTS (Plain Old Telephone Service) – The basic service supplying standard single line telephones, telephone lines, and access to the public switched telephone network.

A system and method for routing calls between a circuit-switched network, such as the Public Switched Telephone Network and a packet network, such as the Internet, is disclosed.

Integrated Devices enable the integration of the Internet (Fig. 1) with the Public Switched Telephone Network (PSTN).

Currently, the majority of telecomm services are provided over the Public Switched Telephone Network and Internet.