Chapter A-Disconnection Causes

ISDN Disconnection Causes

Table A-2ISDN Disconnection Causes

 

 

Disconnection Cause

 

 

 

Number

Summary

Description

 

 

 

1

Unallocated

No route to the number exists in the ISDN network or the

 

(unassigned number)

number was not found in the routing table.

 

 

• Ensure that the number appears in the routing table.

 

 

• Ensure that it is a valid number and that correct digits

 

 

were dialed.

 

 

 

2

No route to specified

The route specified (transit network) between the two

 

transit network

networks does not exist.

 

(national use)

 

 

 

 

3

No route to destination

No physical route to the destination number exists although

 

 

the dialed number is in the routing plan.

 

 

• The PRI D-Channel is malfunctioning.

 

 

• Incorrect connection of the span or WAN.

 

 

 

4

Send special

Return the special information tone to the calling party

 

information tone

indicating that the called user cannot be reached.

 

 

 

5

Misdialed trunk prefix

A trunk prefix has erroneously been included in the called

 

(national use)

user number.

 

 

 

6

Channel Unacceptable

The sending entity in the call does not accept the channel

 

 

most recently identified.

 

 

 

7

Call awarded and

The incoming call is being connected to a channel previously

 

being delivered in an

established for similar calls.

 

Established channel

 

 

 

 

8

Pre-Emption

The call has been pre-empted.

 

 

 

9

Pre-Emption – Circuit

Call is being cleared in response to user request.

 

reserved for reuse

 

 

 

 

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

Called user has received call alert, but has not responded

 

(User Alerted)

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.

 

 

 

Polycom, Inc.

A-7

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Polycom DOC2702A, RMX 1500 manual Disconnection Cause, Number Summary Description
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