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A Response Message:

A response is a message sent by the recipient of a request after it has received and interpreted the request.
A response contains the following information:

Status Code:
Specifies a 3-digit integer that indicates the result of the response.
Reason phrase:
Provides a short textual description of the status code.
Headers:
Specifies the header information.
Message body:
Contains the actual information sent in the response.

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Posted by sagitraz

General Format for Response Messages
• The same as Request Messages except for the Start Line
Start Line –
• SIP Version
• Response Code: three digit number. Identifies the status of the message (more later)
• Reason Phrase: a human readable phrase that explains or clarifies the status code

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Posted by adalson007