SIP Dialer/ VOIP

The Session Initiation Protocol (SIP) is a signaled protocol, which is used widely for controlling multimedia communication sessions (voice and video calls) over Internet Protocol (IP). It is used for modification, creation and termination of two-party or multiparty sessions consisting of one or several media streams. Voice over Internet protocol refers to an IP telephony term, which is meant for a set of facilities, and is used for managing the voice information delivery over the Internet.