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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
- Powered via 802.3af Power over Ethernet (class 2 device) when equipped with optional in-stand splitter or optional 48V local power supply
- Dual Ethernet ports (PC pass-through port with voice priority)
- Static or dynamic address assignment
- The Avaya 1603SW IP phone is compatible with IP Office R5.0 or higher and Avaya Communication Manager R3.0 or higher
