The Avaya 5400 series adds several enhancements over previous generations of digital telephones and works exclusively with Avaya IP Office for the benefit of small and medium sized businesses. These include paperless button labels, local call log and speed dial directories, and streamlined styling consistent with Avaya IP telephones.

The Avaya 5402 is a cost effective two-wire digital telephone, for many office applications. It is designed to complement the 5410 mid-level and 5420 executive telephones. The 5402 has a 2-line x 24-character display with two label-less call appearances, a Listen-Only Speaker, 10 Fixed Feature Keys: Conference, Transfer, Drop, Redial, Speaker, Message, Hold, Mute, Volume Up & Down, and Feature (to access 12 additional dial pad features). The 5402 is Hearing Aid Compatible, has a Message Waiting Indicator that flashes when ringing, eight Personalized Ring Patterns and is either desk or wall mountable.