VoIP vs SIP | SIP Signalling and VoIP Technology
VoIP and SIP are related terms in context of Voice over IP. VoIP is Voice over Internet Protocol and SIP is Session Initiation Protocol. SIP is one of the signalling protocols used in voice over IP. H323 is another Signalling protocol does similar function as SIP. Basically comparing VoIP and SIP is like comparing Apple and Orange but since most people use VoIP and SIP to a same context of Voice over IP technology, devices and applications we have differentiated VoIP and SIP below.
Voice over IP ( VoIP )
VoIP is a technology sending voice over packet networks. Earlier people were using PSTN networks and Mobile Networks to communicate each other. The rapid growth of internet and network technology introduced voice over data networks with carrier grade quality. In simple terms, VoIP means making or receiving phone calls over Internet or Internal Network.
SIP (Session Initiation Protocol)
Session Initiation Protocol (SIP) is an application layer protocol used to establish, modify and terminate multimedia sessions such as VoIP Calls. SIP also can invite new sessions to existing sessions such as multicast conferences. Basically it’s referred as signalling protocol in VoIP environment that can handle call establishment, call control and call termination and generating CDR (Call Detail Record) for billing purposes.
Difference Between VoIP and SIP
(1)VoIP is a technology used in modern telecommunication networks whereas SIP is a signalling protocol (control protocol) used in VoIP
(2)General Term VoIP includes Signalling and Media whereas SIP only refers Signalling plane.