Using The Ts-850I With A Traditional Phone Line - Talkswitch TS-850i User Manual

Using the TS-850i with a traditional phone line

When connected to the traditional telephone network (PSTN) or to a TalkSwitch
system as an analog extension, FLASH is engaged by pressing the R# key. The key
MUST be held for approximately 2 seconds until you connect to the other caller
(call waiting) or receive dial tone to initiate a calling feature.
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