Voice Over IP (VoIP) with Asterisk™ Office PBX:

VOIP (Voice over Internet Protocol) is the set of facilities for delivering voice information in digital form over the Internet. A major advantage of sending voice information over the internet, rather than in the traditional citcuit-commited protocols of the public switched telephone network is that it avoids the tolls charged by ordinary telephone service.

No additional hardware is required to interface Asterisk™ Office PBX with Voice over IP, or to interconnect with digital a variety hardware devices, including all of the hardware manufactured by Asterisk's™ sponsors, Digium. Digium makes single and quad span T1 (North American standard) and E1 (Europe standard) digital interfaces for interconnecting to PRI lines and channel banks as well as a single port FXO card and a one to four-port modular FXS card.

Asterisk™ Office PBX supports a wide range of TDM protocols for the handling and transmission of voice over traditional telephony interfaces. Asterisk™ supports US and European standard signaling types used in standard business phone systems, allowing it to bridge between next generation voice-data integrated networks and existing infrastructure. Asterisk™ not only supports traditional phone equipment, it enhances them with additional capabilities.