Default SIP-to-SS7 ISUP Cause Codes

 

ISUP Cause Value

SIP Response

Normal event

1 – unallocated number

404 Not Found

2 – no route to network

404 Not Found

3 – no route to destination

404 Not Found

16 –  normal call clearing

--- (*)

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 (s/ o diagnostic)

410 Gone

22 – number changed ( w/ diagnostic)

301 Moved permanently

23 – redirection to new destination

 410 Gone

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

510 Not implemented

31 – normal unspecified

480 Temporarily unavailable Resource 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

47 – resource unavailable

 503 Service unavailable Service or option not available

55 – incoming calls barred within CUG

403 Forbidden

57 – bearer capability not authorized

403 Forbidden

58 – bearer capability not presently available

503 Service unavailable

65 – bearer capability not implemented

488 Not Acceptable here

70 – Only restricted digital information bearer capability is available (National use)

488 Not Acceptable here

79 – service or option not implemented

501 Not implemented

Invalid message

 

87 – user not member of CUG

403 Forbidden

88 – incompatible destination

503 Service unavailable

 

 

102 – Call Setup Time-out Failure

504 Gateway timeout

111 – Protocol Error  Unspecified

500 Server internal error Interworking

127 – Internal Error - interworking unspecified

500 Server internal error

 

 

 

500 – Server internal error (default)

 

 

 

 

 

 

 

(*) ISDN Cause 16 will usually result in a BYE or CANCEL

(+) If the cause location is ‘user’ than the 6xx code could be given rather than the 4xx code. the cause value received in the H.225.0 message is unknown in ISUP, the unspecified cause value of the class is sent.

(=) ANSI procedure

 

SIP Status Code to ISDN Cause Code Mapping

Response received Cause value in the REL

400 –  Bad Request 41 – Temporary failure

401 –  Unauthorized 21 – Call rejected (*)

402 –  Payment required 21 – Call rejected

403 –  Forbidden 21 – Call rejected

404 –  Not Found 1   – Unallocated number

405 –  Method not allowed 63 –  Service or option unavailable

406 – Not acceptable 79 – Service/option not implemented (+)

407 – Proxy authentication required 21 – Call rejected (*)

408 – Request timeout 102 – Recovery on timer expiry

410 – Gone 22  –  Number changed (w/o diagnostic)

413 – Request Entity too long 127 – Interworking (+)

414 – Request –URI too long 127 – Interworking (+)

415 – Unsupported media type 79 – Service/option not implemented (+)

416 – Unsupported URI Scheme 127 – Interworking (+)

402 – Bad extension 127 – Interworking (+)

421 – Extension Required 127 – Interworking (+)

423 – Interval Too Brief 127 – Interworking (+)

480 – Temporarily unavailable 18 – No user responding

481 – Call/Transaction Does not Exist 41 – Temporary Failure

482 – Loop Detected 25 – Exchange – routing error

483 – Too many hops 25 – Exchange – routing error

484 – Address incomplete 28 – Invalid Number Format (+)

485 – Ambiguous 1 – Unallocated number

486 – Busy here 17 – User Busy

487 – Request Terminated --- (no mapping)

488 – Not Acceptable here --- by warning header

500 – Server internal error 41 – Temporary Failure

501 – Not implemented 79 – Not implemented, unspecified

502 – Bad gateway 38 – Network out of order

503 – Service unavailable 41 – Temporary Failure

504 – Service time-out 102 – Recovery on timer expiry

505 – Version Not supported 127 – Interworking (+)

513 – Message Too Large 127 – Interworking (+)

600 – Busy everywhere 17 – User busy

603 – Decline 21 – Call rejected

604 – Does not exist anywhere 1 – Unallocated number

606 – Not acceptable --- by warning header