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Failover Based on Telephony Cause Codes
November 2009 232
Failover Scenarios
Refer to Table 10 to determine failover scenarios. The table shows
cause codes that have been found uniformly consistent with
conditions requiring re-routing.
Note that cause codes 18 and 1000 are for cases where the gateway is
unreachable or inoperative.
The cause codes in this table are suggested based on data collected
from various Gateways (shown in Table 11). Entries with “-” specify
scenarios for which no data was collected.
Table 10. Failover Cause Codes
Description Cause Code
No user responding 18
Call Rejected 21
Destination out of order 27
Network out of order 38
Temporary failure 41
Requested circuit channel not avail 44
Service/optio not avail; unavail;
unspecified
63
No dial tone 1000