What is a SIP Phone & How Does It Work

A Session Initiation Protocol (SIP) phone is a type of communication device that uses the SIP protocol to make voice and video calls over the Internet. SIP is a signaling protocol widely used for initiating, maintaining, modifying, and terminating real-time sessions that involve video, voice, messaging, and other communications applications.

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Protocol Initialization

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User Authentication

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Media Negotiation

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What is a SIP Phone & How Does It Work

SIP Phones

Protocol Initialization

Here's how a SIP phone works:

When you make a call on a SIP phone, it sends a request to the SIP server to initialize the communication.

User Authentication

The SIP server authenticates the user, ensuring that they have the right to make the call.

Media Negotiation

SIP phones negotiate the type of media to be used, such as voice or video, and agree on the appropriate codecs for encoding and decoding the data.

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