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Polycom RMX 2000 Administrator’s Guide 
A-11
8
Pre-Emption
The call has been pre-empted.
9
Pre-Emption – 
Circuit reserved 
for reuse
Call is being cleared in response to user 
request.
16
Normal Call 
Clearing
Call cleared normally because user hung up.
17
User Busy
Dialed number is busy.
18
No User 
Responding
The called user has not answered the call.
19
No Answer from 
User (User 
Alerted)
Called user has received call alert, but has not 
responded within a prescribed period of time. 
Internal network timers may initiate this 
disconnection.
20
Subscriber 
Absent
User is temporarily absent from the network - as 
when a mobile user logs off. 
21
Call Rejected
Called number is either busy or has 
compatibility issues. Supplementary service 
constraints in the network may also initiate the 
disconnection.
22
Number 
Changed
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.
26
Non-Selected 
User Clearing
The incoming call has not been assigned to the 
user.
27
Destination Out-
of-Order
Messages cannot be sent to the destination 
number because the span may not be active.
28
Invalid Number 
Format (address 
incomplete)
The Type of Number (TON) is incorrect or the 
number is incomplete. Network, Unknown and 
National numbers have different formats.
Table A-2  
ISDN Disconnection Causes (Continued)
Disconnection Cause
Number
Summary
Description