What Is SIP Protocol?
SIP stands for session initiation protocol. So, SIP protocol is the procedure that initiates phone calls. This telecommunications protocol is used to signal and control multimedia communication sessions. So not only is SIP protocol used for telecommunication, but it is also used for video calls.
Two Phases of Voice Calling In SIP Protocol
There are two distinct phases of initiating an SIP phone call. The first phase is the call setup, which is essentially the collection of details needed to get two phones to communicate. This phase of phone calling is the job of SIP protocol. After gathering details and information, the next phase of data transfer can begin (voice packets moving between two phones).
Why Use SIP Protocol?
With computers and smartphones, people around the world can communicate with SIP protocol. Utilizing VoIP with SIP protocol greatly reduces communication costs. In fact, a call between two SIP protocol users, anywhere in the world, is free. Many businesses utilize this technology with PBX.
Benefits and Features of SIP Protocol
SIP protocol is a very flexible protocol with depth. The general design of the SIP protocol is to setup real-time multimedia sessions between groups of users. So, not only can SIP protocol initiate calls, it can also be used for video and audio meetings. The text-based SIP protocol is centered around a request and response model, which also makes it easy to debug. This is because messages are easy to see and build. Yet, SIP protocol still remains a fairly simple protocol with powerful features in order to model the functions of PBX.
Features for SIP protocol include:
- User Location and Registration
Each telephone notifies SIP of their location. SIP, in turn, determines which lines participate in communication.
- User Availability
Telephones use SIP protocol to determine if they will receive a call.
- User Capabilities
Telephones, or end points, use SIP protocol for media capability.
- Session Setup
SIP protocol communicates with telephones, informing the devices that they should be ringing. Also, SIP protocol is utilized in order to conclude session attributes used by the party calling, and being called.
- Session Management
Finally, SIP protocol transfers calls, terminates calls and changes parameters mid-session.
What You Need to Get Started
In order to communicate with SIP protocol, you must have the following:
- An SIP address
- An SIP client
- Internet connection
- Headset, microphone, earpieces or any hearing and talking devices
- Other SIP protocol users to communicate with