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.

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VoIP for the corporate market
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Siemens videos

VoIP for the corporate market

Siemens Gigaset A580IP VoIP Configuraçï VoIP pelo display

Review Siemens Gigaset C470IP

Siemens Gigaset C450 IP with sipgate

OpenScape Office - unified communications for small business