Talkswitch 48-CA User Manual page 129

Double Flash —is pressing the Flash or Link button twice. You can also depress and
release the telephone's hangup hook or hook switch twice. When using your
telephone's hangup hook to initiate a 'Double Flash', do not try to initiate the second
Flash too quickly or you may disconnect your caller. Press and release the hangup
hook once, count to 2, then initiate the second Flash.
When would you use double flash?
1. If TalkSwitch is connected to any other system/service that uses Flash to activate
its features (e.g. a Key Telephone System, PBX, or telephone line with the Centrex
service from your phone company).
2. If you are using any of your local telephone company services that are activated
with Flash (e.g. Call Waiting, 3-Way Calling/Conference, etc.).
What does Single and Double Flash do?
TalkSwitch and the above-mentioned systems/services use Flash to activate their
calling features. TalkSwitch therefore needs a way to tell which (or whose) features
you want to access when you press the Flash button.
Using a 'Single Flash': places the caller on hold. (The Flash is not passed to the CO
line, solving problems associated with Flash causing a hang-up at some COs).
Using a 'Double Flash': the first Flash places the caller on hold, and the second Flash
(if pressed within 2 seconds) tells TalkSwitch to pass a Flash to the CO line to
activate the intended CO or PBX feature.
Using TalkSwitch with Telephone Company Calling Services 123