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Appendix A: Disconnection Causes
A-16
SIP Failure (cont.) SIP request terminated The endpoint
terminated the request.
The request was
terminated by a BYE or
CANCEL request.
SIP request timeout The request was timed
out.
SIP server error 500 The SIP server sent a
SIP Server Error 500
(Server Internal Error)
response.
The server encountered
an unexpected
condition that prevented
it from fulfilling the
request.
SIP server error 501 The SIP server sent a
SIP Server Error 501
(Not Implemented)
response.
The server does not
support the functionality
required to fulfill the
request.
SIP server error 502 The SIP server sent a
SIP Server Error 502
(Bad Gateway)
response.
The server, while acting
as a gateway or proxy,
received an invalid
response from the
downstream server it
accessed in attempting
to fulfill the request.
Table A-1: Primary Disconnection Reasons (Continued)
Category Cause Message Description