Call Establishment With SIP Control Agent (SCA) (Doc ID 1271158.1)

Last updated on APRIL 05, 2024

Applies to:

Purpose

This document introduces the SIP (Session Initiation Protocol) messaging, as well as the way the Sip Control Agent (SCA) will interact with the other components of the OCNCC application.

Scope

SIP methods and responses types

As an introduction and prerequisite to this article, here is a list of the main SIP methods and a short description of what they are doing :

• REGISTER: Used by a User Agent to indicate its current IP address and the URLs for which it would like to receive calls.
• INVITE: Used to establish a media session between user agents.
• ACK: Confirms reliable message exchanges.
• CANCEL: Terminates a pending request.
• BYE: Terminates a session between two users in a conference.
• OPTIONS: Requests information about the capabilities of a caller, without setting up a call.

Here are the responses ranges for the requests :

• Provisional (1xx): Request received and being processed.
• Success (2xx): The action was successfully received, understood, and accepted.
• Redirection (3xx): Further action needs to be taken (typically by sender) to complete the request.
• Client Error (4xx): The request contains bad syntax or cannot be fulfilled at the server.
• Server Error (5xx): The server failed to fulfill an apparently valid request.
• Global Failure (6xx): The request cannot be fulfilled at any server.

Details

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