Call functUsing a Bluetooth headsetUse an optional Bluetooth headset to talk on thephone without holding the phone to your ear. To usethis feature, you first need to register your headsetand connect it to the phone.p. 88Press <Options> and select Switch to headset orSwitch to phone.Muting or sending key tonesYou can turn the key tones off or on.Press <Options> and select Mute keys or Sendkeys.To communicate with answering machines orcomputerised telephone systems, Send keys mustbe selected.