Version 7.2 521 Mediant 1000B Gateway & E-SBC
User's Manual 24. Manipulation
24.8 Configuring Release Cause Mapping
When a call is disconnected, the reason for the disconnection (or call failure) is sent by the
side (IP or Tel) on which the call disconnection occurred. From the IP side, a SIP response
is sent (e.g., 406); from the Tel side, an ISDN cause code is sent (e.g., 6). You can
configure ISDN-SIP release cause mapping rules, as discussed in this section.
Note: The feature is applicable only to digital interfaces.
24.8.1 SIP-to-ISDN Release Cause Mapping
24.8.1.1 Configuring SIP-to-ISDN Release Cause Mapping
The Release Cause Mapping from SIP to ISDN table lets you configure up to 12 SIP
response code to ISDN ITU-T Q.850 release cause code (call failure) mapping rules. The
table lets you override the default SIP-to-ISDN release cause mappings, listed in ''Fixed
Mapping of SIP Response to ISDN Release Reason'' on page 522. When the device
receives a SIP response from the IP side, it searches the table for a matching SIP
response. If found, the device sends the corresponding Q.850 Release Cause to the
PSTN. If the SIP response is not configured in the table, the default, fixed SIP-to-ISDN
release reason mapping is used.
Note: For Tel-to-IP calls, you can also map less commonly used SIP responses to a
single, default ISDN release cause code, using the DefaultCauseMapISDN2IP
parameter. The parameter defines a default ISDN cause code that is always used,
except when the following Release Causes are received: Normal Call Clearing (16),
User Busy (17), No User Responding (18) or No Answer from User (19).
The following procedure describes how to configure SIP-to-ISDN release cause mapping
through the Web interface. You can also configure it through ini file (CauseMapSIP2ISDN)
or CLI (configure voip > gateway manipulation cause-map-sip2isdn).
 To configure a SIP-to-ISDN release cause mapping rule:
1. Open the Release Cause Mapping from SIP to ISDN table (Setup menu > Signaling
& Media tab > Gateway folder > Manipulation > Release Cause SIP > ISDN).
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