Instruction manual

Page 998 of 3156 China – Busy Tone Detection
553-3001-306 Standard 10.00 January 2002
Operating parameters
The Busy Tone Detection functionality is implemented on the Enhanced
Extended Universal Trunk Card for China (NTRA10AA).
The Meridian 1 will disconnect any call once busy tone is detected on the
incoming side of the trunk. If the user on the far end causes busy tone to be
generated by any means, the call will be disconnected whether or not that was
the intention.
The BTD characteristics are downloaded on a card basis only (not on a unit
basis) and thus all units on the trunk card must go to Public Exchanges that
produce the same busy tone cadence.
Busy Tone Detection may not work with conference bridges in certain
situations. This is due to the nature of conference bridges in such that all of
the trunks are incoming. In the situation where two or more loop start trunks
with BTD disconnect simultaneously, the resulting busy tone from each trunk
may be detected by the BTD inhibitors of the other trunks. The result would
be a stalemate where all trunks remain connected.
If a trunk card is not designed to support the Busy Tone Detection feature (for
example, for future BTD hardware implementation), the functionality can
still be configured in software.
To change Busy Tone Detection assigned to a trunk card, all trunks on the
card must first be removed using overlay 14.
Feature interactions
Loop Start Supervisory Trunks
The interaction with Intelligent Peripheral Equipment (IPE) trunks occurs
because Busy Tone Supervision (BTS) can be configured in conjunction with
any existing supervision type. For the EXUT, BTS can now be configured
with a supervision type of BST (both incoming and outgoing battery reversal)
and Polarity Insensitive (PIP). These supervision type’s call processing
methods are not changed, except that now the first type of supervision
received is the one acted upon.