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Appendix A-Disconnection Causes
A-6
SIP client error 481 The endpoint sent a SIP Client Error 481 (Call/
Transaction Does Not Exist) response.
SIP client error 482 The endpoint sent a SIP Client Error 482 (Loop
Detected) response.
SIP client error 483 The endpoint sent a SIP Client Error 483 (Too
Many Hops) response.
SIP client error 484 The endpoint sent a SIP Client Error 484
(Address Incomplete) response.
The server received a request with a To address
or Request-URI that was incomplete.
SIP client error 485 The endpoint sent a SIP Client Error 485
(Ambiguous) response.
The address provided in the request (Request-
URI) was ambiguous.
SIP client error 488 The endpoint sent a SIP Client Error 488 (Not
Acceptable Here) response.
SIP forbidden The SIP server rejected the request.
The server understood the request, but is
refusing to fulfill it.
SIP global failure 603 A SIP Global Failure 603 (Decline) response was
returned.
The participant's endpoint was successfully
contacted, but the participant explicitly does not
wish to or cannot participate.
SIP global failure 604 A SIP Global Failure 604 (Does Not Exist
Anywhere) response was returned.
The server has authoritative information that the
user indicated in the Request-URI does not exist
anywhere.
SIP global failure 606 A SIP Global Failure 606 (Not Acceptable)
response was returned.
SIP gone The requested resource is no longer available at
the Server and no forwarding address is known.
Table A-1 Call Disconnection Causes (Continued)
Disconnection Cause Description