Here is the manual for your phone. You can download the manual and the instructions for setting up your answering machine are on page 43:
http://www.uniden.com/pdf/DECT1580-3om.pdfSetting Up the Answering System
You can set up your answering system's features from the handset. Only one handset at a time can access the answering system menus.
Note: If you have multiple bases, select the base with answering system you want to access (see page 15).
Recording a Personal Greeting
Your answering system comes with a pre-recorded outgoing message or greeting that plays when you receive a call: "Hello, no one is available to take your call. Please leave a message after the tone." You can record your own personal outgoing greeting. Your recorded greeting must be between two seconds and thirty seconds long.
Press /mute. The system announces the number of new and old messages, then starts to play the messages unless it has no messages.
Press 5 to stop the announcements or message playback. You will hear intermittent beeps indicating that the system is in the command waiting mode.
Press 8 to start the recording. The system announces, "Record greeting." Begin recording after the announcement.
When you finish recording, press 8 again or press 5. You will hear a confirmation tone, and your recorded greeting plays back for you.
Selecting a Greeting
Once you have recorded a personal greeting, the phone automatically switches to your personal greeting. You can
also switch back and forth between the pre-recorded greeting and your own greeting at any time.
Press /mute. The system announces the number of new and old messages, then starts to play the messages unless it has no messages.
Press 5 to stop the announcements or message playback. You will hear intermittent beeps indicating that the system is in the command waiting mode.
Press 6. The system plays the current greeting.
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