US Robotics SportsterVoice User Manual page 7

Speakerphone
You can use your new Sportster as a full-duplex speakerphone without the echoing sound of some speakerphones.
The full-duplex feature allows you to speak at the same time as someone on the other end without losing any sound
quality. This affords you all the convenience of a speakerphone without the extra hardware and cords for the home
or office.
External modems have built-in microphones and you can attach a microphone and speaker to the internal models.
Personal Voice Mail
With Personal Voice Mail, your modem is a full-featured messaging system offering business-quality voice mail
features in the convenience of your home or office.
Using this feature, you can send voice greetings and record voice messages like a standard answering machine
with several "voice mailboxes" on one system. You can even access your voice messages remotely. Your modem
will autodetect incoming fax/voice/data calls and provides fax-on-demand services you can tailor to your needs.
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