AudioCodes Mediant 500L - Configuring ISDN-To-ISDN Release Cause Mapping

Version 7.2 561 Mediant 500L Gateway & E-SBC
User's Manual 25. Manipulation
ISDN Release
Reason
Description
SIP
Response
Description
87 User not member of CUG 503 Service unavailable
88 Incompatible destination 503 Service unavailable
90 Non-Existent CUG 503 Service unavailable
91 Invalid transit network selection 502* Bad gateway
95 Invalid message 503 Service unavailable
96
Mandatory information element is
missing
409* Conflict
97
Message type non-existent or not
implemented
480* Temporarily not available
98
Message not compatible with call state
or message type non-existent or not
implemented
409* Conflict
99
Information element non-existent or not
implemented
480* Not found
100 Invalid information elements contents 501* Not implemented
101 Message not compatible with call state 503* Service unavailable
102 Recovery of timer expiry 408 Request timeout
103
Parameter Non-Existent Or Not
Implemented - Passed On
400 Bad Request
111 Protocol error 500 Server internal error
112 Uknown Error 400 Bad Request
127 Interworking unspecified 500 Server internal error
* Messages and responses were created because the ‘ISUP to SIP Mapping’ draft doesn’t
specify their cause code mapping.
25.8.3 Configuring ISDN-to-ISDN Release Cause Mapping
The Release Cause ISDN to ISDN table lets you configure up to 10 ISDN ITU-T Q.850
release cause code (call failure) to ISDN ITU-T Q.850 release cause code mapping rules.
In other words, it lets you change the originally received ISDN cause code to a different
ISDN cause code. For example, the PSTN may indicate disconnected calls (hang up) by
sending cause code 127. However, you can change the cause code to 16, which is a more
typical cause code for such call scenarios. 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 changes the cause code to the corresponding ISDN cause code. If the ISDN cause
code is not configured in the table, the originally received ISDN cause code is used. If the
new ISDN cause code also appears in the Release Cause Mapping ISDN to SIP table (see
''Configuring ISDN-to-SIP Release Cause Mapping'' on page 558), the device maps it to
the corresponding SIP response code, which it sends to the IP side.