Aastra 55I IP PHONE - RELEASE 2.1 User Manual page 121

To Make and Receive Calls Using a Headset
IP Phone UI
1. Ensure that you have selected a headset audio mode by accessing the Options list
(under option Preferences->Set Audio->Audio Mode on the IP Phone).
2. Plug the headset into the jack.
3. Press the
ing on the audio mode selected from the options menu, a dial tone or an incoming
call will be received on either the headset or the handsfree speakerphone.
4. Press the
key to obtain a dial tone or to answer an incoming call. Depend-
key to end the call.
Model 55i IP Phone User Guide 113