User's Manual
Appendix A-Disconnection Causes
Polycom, Inc. A-9
53 Outgoing Calls Barred 
Within Closed User 
Group (CUG)
Outgoing calls are not permitted for this member of the CUG.
55 Incoming Calls Barred 
within CUG
Incoming calls are not permitted for this member of the CUG.
57 Bearer Capability Not 
Authorized
A bearer capability has been requested that the user is not 
authorized to use.
58 Bearer Capability Not 
Presently Available
A bearer capability has been requested that the user is not 
presently available.
62 Inconsistency in 
Designated Outgoing 
Access Information and 
Subscriber Class
Outgoing Access and Subscriber Class information is 
inconsistent
63 Service or Option Not 
Available, Unspecified
The service or option is unavailable. No other disconnection 
cause applies.
65 Bearer Capability Not 
Implemented
The requested bearer capability is not supported.
66 Channel Type Not 
Implemented
The requested channel type is not supported.
69 Requested Facility Not 
Implemented
The requested supplementary service is not supported.
70 Only Restricted Digital 
Information Bearer 
Capability is Available 
(national use)
Unrestricted (64kb) bearer service has been requested but is 
not supported by the equipment sending this cause.
79 Service or Option Not 
Implemented, 
Unspecified
An unsupported service or unimplemented option has been 
requested. No other disconnection cause applies.
81 Invalid Call Reference 
Value
A message has been received which contains a call 
reference which is currently unassigned or not in use on the 
user-network interface.
82 Identified Channel 
Does Not Exist
A request has been received to use a channel which is 
currently inactive or does not exist.
83 A Suspended Call 
Exists, but This Call 
Identity Does Not Exist
A RESUME message cannot be executed by the network as 
a result of an unknown call identity.
84 Call Identity in Use A SUSPEND message has been received with a call identity 
sequence that is already in use.
85 No Call Suspended A RESUME message cannot be executed by the network as 
a result of no call suspended.
Table A-2  ISDN Disconnection Causes (Continued)
Disconnection Cause
Number Summary Description










