Symbol 1950 from ISO 7000 - Title/Meaning: Call operator of remote station 
Function/description: To identify the display panel indicator which signifies that the remote station is being called.
Own work using: iso.org/obp/graphics/grs/e3846f1d-cc7b-4a0e-9924-2483fd9288da 200.png
Vectorization:  Mrmw