Dialogic 6.2 - Manual (Page 231)

Failover Based on Telephony Cause Codes
November 2009 231
„ Gateway failure during an active call by disconnecting the PSTN
cable.
Applications needing specific information about a call failure can use
the cause codes reported by BfvLineTerminateCall(). However, using
cause codes to determine failover scenarios is complicated. In most
cases, the cause codes supplied by the gateway are
manufacturer-specific and depend on the protocol being used.
Therefore, if you use any particular code in determining a failover
scenario (where re-routing should occur), you should consider the
context including the protocol and the gateway manufacturer.