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If any of the extension has not been connected
to the system then it is deemed to be out of service.
This status must be programmed into the exchange
otherwise the system will keep giving a ring-back
tone if such extension is dialled. To programme
dial :
Password
+
Where, Ext is Extension,
C is code, 0/1 for Out of service or In service.
For
example, if extension 36 is out-of-service,
then dial,
Password
+
Now
if anybody dials 36 he will get an engage tone.
When, subsequently, an instrument is connected
to extension 36 then its in serviced status needs
to be programmed, and is done by dialing,
Password
+
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