The Avaya J139 IP Telephone is an entry-level business VoIP desk phone designed for enterprise communication, call handling, and SIP-based telephony systems.

It is widely used in offices, call centers, and corporate environments where users need reliable voice calling, HD audio quality, and essential call control features.

Key Features

2.8-inch color display (320 × 240 resolution)

Supports SIP-based IP telephony systems

Up to 2–4 programmable line/feature keys (varies by deployment)

HD Voice / Wideband audio for clear communication

Built-in speakerphone with full duplex audio

Dedicated buttons: Messages, Contacts, History, Home

Call functions: Hold, Transfer, Conference, Forward, Call Park/Unpark

Dual Ethernet ports (10/100/1000 Mbps)

Power over Ethernet (PoE Class 1 support)

RJ9 headset support with Electronic Hook Switch (EHS)

Hearing aid compatible handset with volume boost

LED indicators for line status (red/green)

Energy-efficient “sleep mode” design