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VIP-2100 User’s manual - 122 -
PSTN to SIP Cause Code Mapping
PSTN
Cause
Code
Description SIP Event
1 Unallocated number 404 Not found
2 No route to specified transit network 404 Not found
3 No route to destination 404 Not found
17 User busy 486 User here
18 No user response
19 No answer from the user
20 Subscriber absent
480 Temporarily
unavailable
21 Call Rejected 403 Forbidden
22 Number changed 410 Gone
26 Non-selected user clearing 404 Not found
27 Destination out of order 404 Not found
28 Address incomplete
484 Address
incomplete
29 Facility rejected
501 Not
implemented
31 Normal, unspecified 404 Not found
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
47 Resource unavailable
503 Service
unavailable
55
Incoming calls barred within Closed User
Group(CUG)
403 Forbidden
58 Bearer capability not presently available 403 Forbidden
65 Bearer capability not implemented
501 Not
implemented
79 Service or option not implemented
501 Not
implemented
87
User not member of Closed User Group
(CUG)
503 Service
Unavailable
88 Incompatible destination 400 Bad request
95 Invalid message 400 Bad request
102 Recovery on Expires timeout
408 Request
timeout
111 Protocol error 400 Bad request
Any code other than those listed above:
500 Internal server
error