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

With VOIP (Voice over Internet Protocol or IP) voice information is the transmitted and received via the Internet. By using the internet, rather than traditional citcuit-commited protocols of the public telephone network, you do not pay the tolls charged by ordinary telephone companies.

Asterisk™ Office PBX requires no special hardware to connect with VoIP, nor with the variety hardware devices manufactured by Digium, Asterisk's™ sponsors. Some of Digium quality products are single and quad span T1 (US 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 many 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 telephone equipment, it enhances it with additional features.