AASTRA 4187 Plus for BusinessPhone User Guide EN - Manual (Page 10)

Description
BusinessPhone – Dialog 4187 Plus 10
14 Headset key
See section “ Headset ” on page 88.
15 R-key
To make an inquiry, to transfer a call or to establish a conference,
see section “ During Calls ” on page 27.
Note: Sometimes it is necessary to change the flash time
for the R-key, see section “ Flash Time ” on page 78.
16 Volume control
To adjust the volume for the handset, headset and loudspeaker.
See section “ Handset, Loudspeaker and Headset Volume ” on
page 70.
17 Microphone
18 Loudspeaker
19 Prog On/Off switch
To enable or disable the program key. See section “ Settings ” on
page 69.
20 Message Waiting switch
To switch the Message Waiting indication on or off. Also used to
reverse the polarity in case of crossed line cables. See section
“ Settings ” on page 69.
21 Data port
To connect a modem, PC or other telephone equipment.
22 Handset with hearing aid function
Please note: The handset may attract and retain small
metal objects in the earcap region.