What is Voice over Internet Protocol (VoIP)? Is a family of transmission technologies for delivery of voice communications over IP networks such as the Internet or other packet-switched networks.

Voip SIP Gateway_XG220/XG440/XG880_quick guide_eng_Soundwin.wmv

Introduce how to setup the Soundwin XG220/XG440/XG880 Voip SIP Gateway. The PSTN ports are for backup, when power failure, internet drop or register to server failure, user can still call by PSTN line.

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