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.
Telekom Srbija
Telekom Srbija" a.d. with its head office in Belgrade, Takovska 2, was incorporated as a joint stock company in June 1997. In direct sale, 49% of share capital worth DEM 1.568 billion was privatized - 29% was purchased by Italian STET and 20% by Greek OTE
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