User's Manual
D. SIP / ISDN Release Reason Mapping
Version 2.2
177
July 2007
D
SIP / ISDN Release Reason Mapping
D.1
Mapping of ISDN Release Reason to SIP Response
Table
D-1: Mapping of ISDN Release Reason to SIP Response
(continues on pages 177 to 178)
ISDN
Release
Reason
Description
SIP
Response
Description
1
Unallocated number
404
Not found
2
No route to network
404
Not found
3
No route to destination
404
Not found
6
Channel unacceptable
406
*
Not acceptable
7
Call awarded and being delivered in an
established channel
500
Server internal error
16
Normal call clearing
-
*
BYE
17
User busy
486
Busy here
18
No user responding
408
Request timeout
19
No answer from the user
480
Temporarily unavailable
20
Subscriber absent
480
Temporarily unavailable
21
Call rejected
403
Forbidden
22
Number changed w/o diagnostic
410
Gone
22
Number changed with diagnostic
410
Gone
23
Redirection to new destination
480
Temporarily unavailable
26
Non-selected user clearing
404
Not found
27
Destination out of order
502
Bad gateway
28
Address incomplete
484
Address incomplete
29
Facility rejected
501
Not implemented
30
Response to status enquiry
501
*
Not implemented
31
Normal unspecified
480
Temporarily unavailable
34
No circuit available
503
Service unavailable
38
Network out of order
503
Service unavailable
41
Temporary failure
503
Service unavailable
42
Switching equipment congestion
503
Service unavailable
43
Access information discarded
502
*
Bad gateway
44
Requested channel not available
503
*
Service unavailable
47
Resource unavailable
503
Service unavailable
49
QoS unavailable
503
*
Service unavailable
50
Facility not subscribed
503
*
Service unavailable
55
Incoming calls barred within CUG
403
Forbidden
57
Bearer capability not authorized
403
Forbidden
*
Messages and responses were created since the ‘ISUP to SIP Mapping’ draft doesn’t specify their
cause code mapping.
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