Failover Based on Telephony Cause Codes
November 2009 235
Gateway with
responding SIP/H.323
and PSTN down (no
PSTN cable connected)
SIP -41 -41 11117 41
Gateway with
responding SIP/H.323
and PSTN down due to
an alarm
SIP -41 ------41
Gateway SIP/H.323
channels exceeded SIP -21 -41 41 41 41 17 -
Gateway PSTN
channels exceeded SIP -------041
Gateway failure during
an active call by
disconnecting the
PSTN cable
SIP -0-16 16 16 16 16 16
Gateway with
responding SIP/H.323
and PSTN up but not
waiting for calls
SIP -41 -41 41 41 41 41 41
Scenario SR140
Protocol GnuGK Alcatel Avaya SIP
Control Cisco
2821 CCM6.01 CCM6.1 Quintum IM1010