Toa VS-900 - Manual (Page 14)

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CHAPTER 1. SUBSTATION OPERATION
2.1.2. Calling by Lifting the Handset (only when the RS-190 and RS-191 are combined)
Step 1. Lift the handset.
Calls the designated master station.
The RS-190's call lamp flashes.
[System pre-programming]
The master station corresponding to the substation must
be registered by system programming at the time of
installation.
Step 2. If the master station responds, a brief call tone is
sounded through the handset speaker.
The call lamp mode changes from flashing to
steady-on state.
Speak into the handset.
Step 3. If the handset replaces or the master station
replaces the handset or presses the [C] key, the
conversation is terminated.
The call lamp is extinguished.
Brief call tone