Polycom realpresence 1800 Administrator's Manual page 935

ISDN Disconnection Causes
Number Summary
70 Only Restricted Digital
Information Bearer
Capability is Available
(national use)
79 Service or Option Not
Implemented, Unspecified
81 Invalid Call Reference
Value
82 Identified Channel Does
Not Exist
83 A Suspended Call Exists,
but This Call Identity Does
Not Exist
84 Call Identity in Use
85 No Call Suspended
86 Call Having the Requested
Call Identity Has Been
Cleared
87 User Not Member of CUG
88 Incompatible Destination
90 Non-Existent CUG
91 Invalid Transit Network
Selection (national use)
95 Invalid Message,
Unspecified
96 Mandatory Information
Element is Missing
97 Message Type
Non-Existent or Not
Implemented
98 Message is Not Compatible
with the Call State, or the
Message Type is
Non-Existent or Not
Implemented
Polycom®, Inc.
Description
Unrestricted (64kb) bearer service has been requested but is not
supported by the equipment sending this cause.
An unsupported service or unimplemented option has been requested.
No other disconnection cause applies.
A message has been received which contains a call reference which is
currently unassigned or not in use on the user-network interface.
A request has been received to use a channel which is currently
inactive or does not exist.
A RESUME message cannot be executed by the network as a result of
an unknown call identity.
A SUSPEND message has been received with a call identity sequence
that is already in use.
A RESUME message cannot be executed by the network as a result of
no call suspended.
A RESUME message cannot be executed by the network as a result of
the call having been cleared while suspended.
A CUG member was called by a user who is not a member of the CUG
or a CUG call was made to a non CUG member.
User-to-user compatibility checking procedures in a point-to-point data
link have determined that an incompatibility exists between Bearer
capabilities.
CUG does not exist.
The transit network selection is of an incorrect format. No route (transit
network) exists between the two networks.
Invalid message received. No other disconnection cause applies.
A message was received with an information element missing.
A message was received that is of a type that is not defined or of a type
that is defined but not implemented.
An unexpected message or unrecognized message incompatible with
the call state has been received
Appendix A - Disconnection Causes
904