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TECHNICAL DATA & TROUBLESHOOTING | 87
CLASS 1.5 (invalid message; e.g. parameter out of range)
Cause No. 81 – Invalid call reference value
is cause indicates that the equipment sending this cause has received a message with a call
reference which is not currently in use on the user-network interface. is value only applies if
the call reference values 1 or 2 octets long and is not the global call reference.
Cause No. 82 – Identified channel does not exist
is cause is sent when the equipment sending this cause has received a request to use a channel
not active on the interface for a call
Cause No. 83
A suspended call exists, but this call’s identity does not
Cause No. 84 – Call identity in use
is cause indicates that a call identity is in use.
Cause No. 85 – No call suspended
is cause indicates that no call is suspended.
Cause No. 86 – Requested call identity cleared
is cause indicates that the call having the requested called entity has cleared.
Cause No. 87 – Destination not a member of CUG
is cause indicates that the address of an outgoing call attempt is not a member of the Closed
User Group.
Cause No. 88 - Incompatible destination
is cause indicates that the equipment sending this cause has received a request to establish a
call which has low layer compatibility, high layer compatibility or other compatibility attributes
(e.g. data rate, DN subaddress) which cannot be accommodated. is call can also be returned
by a switch to a CPE when trying to route a call to an incompatible facility, or one without data
rate.
Cause No. 90 – Destination address incomplete/Non-existent CUG
is cause indicates that the destination address is missing or incomplete
or
Indicates a non-existent Closed User Group
Cause No. 91 - Invalid transit network selection
is cause indicates that an Invalid transit network selection has been requested.
Cause No. 92 – Invalid supplementary service parameter [VN4 only]
Used to indicate an invalid parameter for supplementary service
Cause No. 95 – Invalid message, unspecified
is cause indicates that the entity sending this cause has received and Invalid message, only
when no other cause in this class applies.
CLASS 1.6 (protocol error; e.g. unknown message)
Cause No. 96 – Mandatory Info missing
is cause indicates that the equipment sending this cause has received a message which is
missing an information element which must be present in the message before that message can