AT&T CL4939 - Manual (Page 48)

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You may have two different types of voice messages: those left on your
built-in answering system and those left on your service provider’s voicemail
system (fees may apply). Your telephone’s built-in answering system messages
and voicemail messages are separate.
To listen to your voicemail, you typically dial an access number provided by
your telephone service provider, followed by a security code or PIN. Some
service providers bundle or combine multiple services like voicemail and call
waiting, so you may not be aware that you have voicemail. To check what
services you have and how to access them, contact your telephone service
provider.
To use your voicemail service rather than your answering system, turn off
your answering system. To use your answering system rather than your
voicemail service, contact your telephone service provider to deactivate your
voicemail service. You can also use your telephone answering system and
voicemail together by setting your built-in answering system to answer before
voicemail answers. To learn how to program your voicemail settings, contact
your telephone service provider. Then, if you are on a call, or if the answering
system is busy recording a message and you receive another call, the second
caller can leave a voicemail message.
If you have voicemail provided by your telephone service provider, we
recommend setting your answering system to answer calls at least two rings
earlier than your voicemail is set to answer. For example, if your voicemail
answers after six rings, set your answering system to answer after four rings.
Some voicemail providers may program the delay before answering calls
in seconds instead of rings. In this case, allow six seconds per ring when
determining the appropriate setting.
About the answering system and voicemail
Answering system operation