FIELD: information technology.
SUBSTANCE: in its basic design, the device has at least one tube (1), a housing (2) and an optical display unit (5). According to the invention, the optical display unit is a support (5) for the tube in the housing (2), which is made as a light transmitting and scattering unit. Light (12) from a luminous means (6) is transmitted to said unit.
EFFECT: high reliability of indicating a call.
13 cl, 2 dwg
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