Carrier Ethernet - Dedicated Internet Access - IP Telephony - VPN VPLS MPLS Network Solutions

Session Initiation Protocol or SIP is an Internet Engineering Task Force (IETF) signaling protocol (RFC 3261), widely used for controlling multimedia communication sessions such as voice calls, video calls, video conferencing, streaming multimedia distribution, instant messaging, presence information and file transfer over Internet Protocol (IP). The SIP protocol can be used for creating, modifying and terminating two-party (unicast) or multiparty (multicast) sessions consisting of one or several media streams. Modification can include changing addresses or ports, inviting more participants, and adding or deleting media streams.