ISDN Software Reference for Linux and Windows
344
Error Name Hex Value
(Decimal) Q.931 Code and Description
INVALID_NUMBER_FORMAT 0x21C
(540) Cause 28
Invalid number format
(incomplete number)
FACILITY_REJECTED 0x21D
(541) Cause 29
Facility rejected
RESP_TO_STAT_ENQ 0x21E
(542) Cause 30
Response to STATUS
ENQUIRY
UNSPECIFIED_CAUSE 0x21F
(543) Cause 31
Normal, unspecified cause
NO_CIRCUIT_AVAILABLE 0x222
(546) Cause 34
No circuit/channel available
NETWORK_OUT_OF_ORDER 0x226
(550) Cause 38
Network out of order
TEMPORARY_FAILURE 0x229
(553) Cause 41
Temporary failure
NETWORK_CONGESTION 0x22A
(554) Cause 42
Switching equipment
congestion
REQ_CHANNEL_NOT_AVAIL 0x22C
(556) Cause 44
Requested channel/circuit not
available
PRE_EMPTED 0x22C
(557) Cause 45
Call preempted
FACILITY_NOT_SUBSCRIBED 0x232
(562) Cause 50
Requested facility not
subscribed