What are VOIP and SIP?

1, VOIP: It is a voice call technology, which realizes voice call and multimedia conference through Internet protocol (IP), that is, communication through the Internet. VoIP can be used in many Internet access devices, including VoIP phones, smart phones and personal computers, to make calls and send short messages through cellular networks and Wi-Fi.

2.SIP: It is an application layer signaling control protocol. Used to create, modify and terminate sessions with one or more participants. The structure of SIP is similar to that of HTTP (Client-Server Protocol). The client sends the request and sends it to the server. The server processes these requests and sends a response to the client. The request and the response form a transaction.

Extended data:

Other agreements

1, MGCP (media gateway control protocol)

The Media Gateway Control Protocol (MGCP) defines the communication service between the call control unit (call agent or media gateway) and the telephone gateway. MGCP is a control protocol that allows the central console to monitor IP phone and gateway events and notify them to send content to the specified address. In MGCP structure, intelligent call control is placed outside the gateway and handled by the call control unit (call agent). At the same time, the call control units keep synchronization with each other and send consistent commands to the gateway.

2. Media Gateway Control Protocol MEGACO

Media Gateway Control Protocol (MEGACO) is the result of joint efforts of IETF and ITU-T(ITU-TH.248 recommendation). Megaco/H.248 is a protocol for controlling protocol units of physically separated multimedia gateways, so that call control can be separated from media conversion. Megaco/H.248 informs the media gateway to connect the data stream from outside the packet or unit data network to the packet or unit data stream, such as Real-time Transport Protocol (RTP).

Baidu encyclopedia-VoIP

Baidu Encyclopedia -SIP (Session Initiation Protocol)