Polycom RealPresence 1500 Administrator's Manual page 956

Disconnection Cause
Number Summary
17 User Busy
18 No User Responding
19 No Answer from User
(User Alerted)
20 Subscriber Absent
21 Call Rejected
22 Number Changed
26 Non-Selected User
Clearing
27 Destination Out-of-Order
28 Invalid Number Format
(address incomplete)
29 Facility Rejected
30 Response to STATUS
ENQUIRY
31 Normal, Unspecified
34 No Circuit/Channel
Available
38 Network Out-of-Order
39 Permanent Frame Mode
Connection Out-of-Service
40 Permanent Frame Mode
Connection Operational
41 Temporary Failure
42 Switching Equipment
Congestion
43 Access Information
Discarded
Polycom®, Inc.
Description
Dialed number is busy.
The called user has not answered the call.
Called user has received call alert, but has not responded within a
prescribed period of time. Internal network timers may initiate this
disconnection.
User is temporarily absent from the network - as when a mobile user
logs off.
Called number is either busy or has compatibility issues.
Supplementary service constraints in the network may also initiate the
disconnection.
Same as Cause 1. The diagnostic field contains the new called user
number. Cause 1 is used if the network does not support this cause
value.
The incoming call has not been assigned to the user.
Messages cannot be sent to the destination number because the span
may not be active.
The Type of Number (TON) is incorrect or the number is incomplete.
Network, Unknown and National numbers have different formats.
User requested supplementary service which cannot be provided by
the network.
A STATUS message has been received in response to a prior STATUS
ENQUIRY.
A normal, unspecified disconnection has occurred.
No B-Channels are available for the call.
Network is out-of-order because due to a major malfunction.
A permanent frame mode connection is out-of-service. This cause is
part of a STATUS message.
A permanent frame mode connection is operational. This cause is part
of a STATUS message.
Minor network malfunction. Initiate call again.
High traffic has congested the switching equipment. Cause 43 is
included.
Access Information elements exceed maximum length and have been
discarded. Included with Cause 42.
Appendix A - Disconnection Causes
926