2. SIP messages
Due to SIP's client-server orientation, the messages exchanged are either requests or responses. In both cases, the messages are text-based (like HTTP messages on the World Wide Web), which essentially makes the protocol easier to implement and more extensible.
The current version of SIP (version 2.0,
[2]
) provides for six distinct requests, enabling a call to be set up, capacities to be negotiated (media types to be used for audiovisual exchanges) or a session to be closed:
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SIP messages