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Common response codes are shown below (for a complete list, see Table B-8).
Table B-4 Common Responses
Code
Definition
100
Trying
180
Ringing
183
Session progress
200
Ok
302
Moved temporarily When forwarding has been activated on the phone
305
Use proxy
400
Bad request
401
Unauthorized
403
Forbidden
404
Not found
415
Unsupported
media type
500
Server internal
error
501
Not implemented
606
Not acceptable
Content of Messages
SIP messages consist of the following three parts:
•
SIP URI: The SIP URI is typically built around the user's phone number.
This first line also indicates either the purpose of the request or the response
given by the called party.
Appendix B: SIP Overview
When the other side is trying to process the request
When the other side is ringing
When the event is successful
number that is being called
When a client enters a bad request
When authentication is required
When a phone number cannot be located
When the SDP contains no common codecs (this can
happen if one side supports only G.729 and the PBX
has no G.729 license defined)
When the SIP server is out of resources
When a global failure occurs (usually at the carrier
level)
Occurrence
505
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