User's Manual 488 Document #: LTRT-89730
Mediant 3000
SIP Response
Description
ISDN Release
Reason
Description
482* Loop detected 127 Interworking
483 Too many hops 127 Interworking
484 Address incomplete 28 Invalid number format
485 Ambiguous 1 Unallocated number
486 Busy here 17 User busy
488 Not acceptable here 31 Normal, unspecified
500 Server internal error 41 Temporary failure
501 Not implemented 38 Network out of order
502 Bad gateway 38 Network out of order
503 Service unavailable 41 Temporary failure
504 Server timeout 102 Recovery on timer expiry
505* Version not supported 127 Interworking
600 Busy everywhere 17 User busy
603 Decline 21 Call rejected
604 Does not exist anywhere 1 Unallocated number
606* Not acceptable 38 Network out of order
* Messages and responses were created because the ‘ISUP to SIP Mapping’ draft does
not specify their cause code mapping.
24.8.2 ISDN-to-SIP Release Cause Mapping
24.8.2.1 Configuring ISDN-to-SIP Release Cause Mapping
The Release Cause Mapping from ISDN to SIP table lets you configure up to 12 ISDN ITU-
T Q.850 release cause code (call failure) to SIP response code mapping rules. The table
lets you override the default ISDN-to-SIP release cause mappings, listed in ''Fixed Mapping
of ISDN Release Reason to SIP Response'' on page 489. When the device receives an
ISDN cause code from the PSTN side, it searches the table for a matching ISDN cause
code. If found, the device sends the corresponding SIP response to the IP. If the ISDN
cause code is not configured in the table, the default, fixed ISDN-to-SIP release reason
mapping is used.
Note: You can change the originally received ISDN cause code to any other ISDN
cause code, using the Release Cause ISDN to ISDN table (see ''Configuring ISDN-to-
ISDN Release Cause Mapping'' on page 491). If the originally received ISDN cause
code appears in both the Release Cause ISDN to ISDN table and the Release Cause
Mapping ISDN to SIP table, the mapping rule in the Release Cause Mapping ISDN to
SIP table is ignored. The device only uses a mapping rule that matches the new ISDN
cause code.
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