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The Verification Network
------------------------
In a TSPS office, a verification circuit is associated with a 4-wire
OutGoing Trunk (OGT) and a 3-way/4-wire bridging repeater arrangement. This is
the circuit that does the speech scrambling. The speech and other tones (like
busy and re-order) are frequency shifted, but are still recognizable by a TSPS
operator.
TSPS verification trunks are connected via dedicated lines to incoming
verification trunks in a toll office. The toll office provides either a link
to an outgoing trunk and dedicated facilities to another toll office, or an
outgoing toll connecting trunk and dedicated facilities to an incoming
verification trunk in a local office. Each toll office has ways to check the
security of verification trunks. In electronic toll offices (ESS offices), two
independent office data translations provide security of the trunk. Electro-
mechanical toll offices (Such as a CrossBar Tandem (XBT)) use an electrical
cross-office check signal or a segregated switching train to control trunk
connections. Verification trunks relay supervisory signals (such as answering
supervision) to TSPS from the line being verified. Also, if verification
trunks are busy, the TSPS operator will receive a re-order.
The functions of the VFY key
----------------------------
When the operator presses the VFY key, several checks are made upon the
number that has been entered. These are:
A Check to see if the line is within the verification network accessible
by that particular TSPS. If the line is not, the VFY key will flash.
A check to see if the owner of the line wishes BLV to be possible or not.
If the line is something like a police emergency line, then the VFY key will
flash, similar to the first check.
Important TSPS keys
-------------------
When the VFY lamp lights steady (doesn't flash), indicating the process is
acceptable, the operator puts the calling customer on hold and accesses an
idle loop on the operator position. The ACS (Access) lamp lights steady if a
verification trunk is available at that time. Then, the operator presses the
ST key which sends out the complete number to be verified, in MF. The
verification circuit activates, and the operator listens for scrambled speech
and also watches the CLD (Called) lamp on her console. The CLD lamp is lighted
when the operator loop was accessed, and will remain lit if the line being
verified is on-hook. The operator has two ways of seeing if the line is in
use, by listening, and by watching the CLD lamp. If the CLD lamp light goes
out, then the line is off-hook.
If a successful BLV/EMER INT is performed, the operator presses the REC
MSG MSG (Record Message) key, which completes the verification. If the EMER
INT lamp is lit, the charges for the interrupt and the verification are
automatically billed. If the VFY key is pressed twice, it indicates the
verification should not be billed. This could be due to a customer error or a
customer disconnect.
Charging capabilities
---------------------
A customer can pay for a BLV/EMER INT in several ways. They can have the
charges put on their phone bill, if they are calling from their home, they can
bill the charges to an AT&T Calling Card, or pay directly from a coinphone.
Details of the BLV/EMER INT function are recorded on AMA tape, which is later
processed at the RAO (Revenue Accounting Office).
The classes of charge are as follows: STATION PAID, which means exactly
what it says, STATION SPECIAL CALLING, in cases where billing is handled by a
Calling Card or third number billing, and NO AMA, in unusual billing cases.
Also, for BLV/EMER INT calls that originate from a hotel, TSPS can send
charges to HOBIS (Hotel Billing Information System), HOBIC (Hotel Billing
Information Center), or a TTY at the hotel.
AMA records for BLV/EMER INT are recorded in basically the same format
that normal calls are recorded. The only difference is that a numeric data
group is added. The leftmost digit in the data group is a 1 if only a BLV was
done, but it is a 2 if both a BLV and an EMER INT were done. In case of an
aborted BLV, the billing record is marked 'No charge'.
Inward Operator differences
---------------------------
When an Inward operator does BLV/EMER INT, the class of charge is always
NO AMA, because billing is handled at the local TSPS site. Inwards also do not
use the REC MSG key when a TSPS would, they use the VFY key in it's place.
The Speech scrambling technique
-------------------------------
The speech scrambling technique that exists to keep the customers privacy
intact is located in the TSPS console, and not in the verification trunks. The
scrambling technique can only be deactivated by an operator pressing the EMER
INT key, or a craftsperson using the console in a special mode. When the
scrambler is deactivated by an operator doing an EMER INT, the customer hears
an alerting tone (as mentioned in the first BLV file) made up of a 440Hz tone.
This tone is initially played for two seconds, and then once every ten seconds
afterwards until the operator presses her Position Release (POS RLS) key.
Operator trouble reporting