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- 2 row x 16 character backlit display
- Supports 3-line appearances with dual LEDs
- Fixed feature buttons include volume up/down, mute, speaker, menu, hold, conference, transfer, drop, redial
- High-quality 2-way speakerphone
- Message waiting indicator
- Integrated headset jack
- Desk or wall mountable with optional wall mount adapter
- Firmware upgradeable
- 8 personalized ring patterns
- Optional local power supply(700429640)
- Optional Power over Ethernet adapter(700415607) fits completely in the stand of the phone
- Single Ethernet port
- Static or dynamic address assignment
- Compatibility: The Avaya 1603 IP phone is compatible with IP Office R4.2 or higher and Avaya Communication Manager R3.0 or higher
