Tanthauzo: SIP - Session Initiation Protocol - ndi protocol yothandizira mauthenga omwe amagwiritsidwa ntchito popereka chizindikiro cha Voice over IP (VoIP) . Muzithunzithunzi za VoIP , SIP ndiyo njira yowonjezera yosonyeza kugwiritsa ntchito miyezo ya H.323 protocol.
SIP yapangidwa kuti igwirizane ndi machitidwe a machitidwe a foni zamakono. Komabe, mosiyana ndi chikhalidwe cha SS7 chosonyeza foni, SIP ndi protocol-peer protocol. SIP imakhalanso protocol yodalirana ya ma multimedia mauthenga osagwiritsidwa ntchito kuzinthu zamvekedwe.