Ericsson DT59C - Manual (Page 72)

Messages
DT590 72
Manual Message Waiting (MMW)
If the called extension does not answer you can initiate a message
waiting indication on that extension (if this function is allowed). If
there is a message waiting for you, you will hear a special dial tone.
Answer MMW Ь Ы
Press.
A call is initiated to the extension that requested the MMW.
Order MMW to another extension
In idle mode: *31* ¿
Dial and enter the extension number.
# Ь Ы
Press.
Wait for the call timer to start in the display. Ъ Щ
Press to finish the procedure.
The message is sent to the called extension.
Cancel MMW to another extension #31* ¿
Dial and enter the extension number.
# Ь Ы
Press.
Wait for the call timer to start in the display. Ъ Щ
Press to finish the procedure.