Incazelo: I- Protocol ye-SIP - Session Initiation - iyinqubo yokuxhumana yenethiwekhi evame ukusetshenziswa ku- Voice over IP (VoIP) . Kwi-network ye- VoIP , i-SIP yindlela ehlukile yokusayina ngokusebenzisa ama-protocol eH.323 .
I-SIP yakhelwe ukusekela izici zokushaya zezinhlelo zocingo zendabuko. Kodwa-ke, ngokungafani nobuchwepheshe bendabuko be-SS7 yokubonisa ucingo, i-SIP yinkambiso yontanga. I-SIP iphinde ibe nenqubo-jikelele yenhloso yokuxhumana kwe-multimedia engagcini ekusetshenzisweni kwezwi.