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MGC Manager User’s Guide
A-17
SIP Failure (cont.) SIP server error 503 The SIP server sent a
SIP Server Error 503
(Service Unavailable)
response.
The server is
temporarily unable to
process the request due
to a temporary
overloading or
maintenance of the
server.
SIP server error 504 The SIP server sent a
SIP Server Error 504
(Server Time-out)
response.
The server did not
receive a timely
response from an
external server it
accessed in attempting
to process the request.
SIP server error 505 The SIP server sent a
SIP Server Error 505
(Version Not Supported)
response.
The server does not
support, or refuses to
support, the SIP
protocol version that
was used in the request.
Table A-1: Primary Disconnection Reasons (Continued)
Category Cause Message Description