Appendix B: SIP Overview
505
Common response codes are shown below (for a complete list, see Table B-8).
Table B-4
Common Responses
Code
Definition
Occurrence
100
Trying
When the other side is trying to process the request
180
Ringing
When the other side is ringing
183
Session progress
200
Ok
When the event is successful
302
Moved temporarily When forwarding has been activated on the phone
number that is being called
305
Use proxy
400
Bad request
When a client enters a bad request
401
Unauthorized
When authentication is required
403
Forbidden
404
Not found
When a phone number cannot be located
415
Unsupported
media type
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)
500
Server internal
error
When the SIP server is out of resources
501
Not implemented
606
Not acceptable
When a global failure occurs (usually at the carrier
level)
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.
Summary of Contents for ONE IP
Page 4: ......
Page 19: ...Part I Getting Started...
Page 20: ...Part I Getting Started...
Page 47: ...Part II Administering the System...
Page 48: ...Part II Administering the System...
Page 195: ...Deploying the snom ONE IP Telephone System 526...
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