Message waiting indicator (MWI)
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MWI with special ring tone
When the switch is set to SR (Special Ring), the LED flashes when the telecommu-
nication system sends a special ring tone. This special ring tone is made up of three
parts, T1---T2---T3. The times for T1---T2---T3 can be set (see also Page 24, "Set-
tings").
T1 (1st call signal frequency = 50Hz, duration = 0 to 990 ms)
T2 (call signal pause with duration = 0 to 990 ms)
T3 (2nd call signal frequency = 50Hz, duration = 0 to 990 ms)
This type of MWI is supported for example by the Siemens HighPath 3550 and 3750
systems. Settings expected for the Siemens system: T1=040, T2=110, T3=040.
Settings expected for NEC telephone systems: T1=150, T2=330, T3=150.
However, we strongly recommend discussing the settings with the technician who
set up the system.
To disable the MWI, press ESC or simply pick up the receiver.
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