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Failover Based on Telephony Cause Codes
November 2009 234
Gateway with
responding SIP/H323
and PSTN down (no
PSTN cable connected)
H.323 1000 27 34 - 1000 1 1 17 -
Gateway with
responding SIP/H.323
and PSTN down due to
an alarm
H.323 17 27 34 - - - - 0 -
Gateway SIP/H.323
channels exceeded
H.323 1000 34 1000 - 1000 63, 41 44 1000 -
Gateway PSTN
channels exceeded
H.323 17 - - - - - - - -
Gateway failure during
an active call by
disconnecting the
PSTN cable
H.323 0 0 38 - 34 34 34 16 -
Gateway with
responding SIP/H.323
and PSTN up but not
waiting for calls
H.323 17 27 34 - 44 44 44 41 -
SIP
Unreachable IP
address
SIP 18 18 18 18 18 18 18 18 18
Reachable IP address
with no SIP/H.323
responds
SIP 41 41 41 41 41 41 41 41 41
Gateway failure during
an active call by
disconnecting the
network cable on
SR140
SIP 41 41 41 41 41 41 41 41 41
Gateway failure during
an active call by
disconnecting the
network cable on the
gateway
SIP 18 18 18 18 18 18 18 18 18
Scenario SR140
Protocol
GnuGK Alcatel Avaya SIP
Control
Cisco
2821
CCM6.01 CCM6.1 Quintum IM1010