Compucessory 55251 Série Guide D'installation Et Manuel D'utilisateur page 9

I.3.4 Telephone/Computer Application Switch
The Telephone/Computer Application Switch (8) is for you to select
either computer operation or telephone communication. Should this
switching result with no sound, be sure to first check the
Headset/Handset Application Switch to see if it's set properly.
I.3.5 Headset/Handset Application Switch
The Headset/Handset Application Switch (11) is for you to choose
between using the handset of your telephone base unit or the
telephone headset provided. Again, do not forget to switch the proper
setting of Telephone/Computer Application Switch, before use.
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