Session Initiation Protocol (SIP) is a text-based standard put in place by the Internet Engineering Task Force (IETF) and is the primary protocol for Voice over Internet Protocol services. SIP is similar to a MGCP in that it's a signaling protocol that can create, maintain and terminate sessions in IP-based networks. These sessions include multimedia conferencing and two-way phone calls. SIP protocol can run on User Datagram Protocol (UDP), Stream Control Transmission Protocol (SCTP) and Transmission Control Protocol (TCP) because it was created to function independently from the underlying Transport Layer as an Application Layer.
AirTouch
AirTouch WiFiVoIP enable you can enjoy the best of both world, seamlessly. Enjoy the affordable AirTouch WiFiVoIP network when you are within WiFi range and automatic forward calls to your GSM network otherwise. In fact both WiFiVoIP and GSM will work at
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