Flash dial
tone
OK
OK
Timed flash
( 450
ms)
to CO/PBX operator
Flash dial tone - connection put
on hold (C HOLD)
Third station goes on-hook.
Originating station flashes.
I
Original Connection
re-established.
TABL E K
CO/PBX O P ERATOR R E CALL
CO/PBX call in progress
Station flashes switch hook
Dial
00
Operator answers
TABL E L
SUP ERVISORY FL AS H F EA TUR ES
(C HOLD , CADD , X F ER )
Connection established to another 6B
station or CO/PBX line
I
Station flashes switchhook
Third station dialed
+
answers
Originating station flashes
. .
I
.
I
.
h
Ongma connection re-establis ed,
third station added (CADD)
ISS I, SECTION S 1 8-4 1 1- 1 00
FAI L U R E
Error tone - no CO/PBX l i n k available
Originating station goes on·hook
I
Third station connected to held station
( XFER)
Page 3 1
BSP S18·411·100-i01_1978-08-3l.jpg Scanned by Fra n k Harrell, (Cowboy Frank) Castle Rock, Colorado Oct 15, 2012 21:05:30