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The M3903 Enhanced Telephone is a multi-line digital phone supporting up to four lines and/or features. The productivity-enhancing Call Log feature displays the incoming and outgoing calls while the fixed feature keys allow you to switch easily from handset or hands free to headset use, personalize the phone using the Options list, and quickly access your voice messaging system.

With the "Smart" Mute feature, the M3903 series phone automatically senses whether you're using the handset, headset, or hands free, and mutes the correct path-helping you be sure your private comments stay private. With "Smart" Mute, you can also listen in on a conference call while you work on other tasks, without distracting the conference with extraneous background sounds.