During a call: Switch from pulse dialing to tone dialing.

In call log reviewing mode: Press repeatedly to view the alternate dialing sequences.

K Ringer off key #

In idle mode: Insert #. Long press to turn the ringer on/off.

During a call: Insert #. Long press to insert a pause.

In text editing mode: Switch

between upper and lower case. Long press to insert a pause.

L Mute key M

During a call: Mute/unmute the handset microphone.

10

MCall transfer/Intercom keyi

In idle mode: Initiate an internal call.

During a call: Hold the line and page another handset or toggle between an external and internal call. Long press to initiate a conference call.

NMicrophone

OBattery door

PLoudspeaker

!Warning

Handsfree activation can suddenly increase the volume in the earpiece to a very high level. Make sure the handset is not too close to your ear.

Q Belt clip

Your phone

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Philips CD1550B Ringer off key #, Mute key M, Call transfer/Intercom keyi, Microphone Battery door Loudspeaker, Belt clip