Aastra 536M – 36-Key Expansion Module (A1736-0000-10-55) - Using your Aastra 55i, 57i & 57i-CT with Aastra 536M, call coverage and management is even more easy and efficient to handle. With the expansion module, you add additional programmable keys and LEDs, increasing your total number of keys and LEDs.

Aastra 536M Features:

Flexible Features: The 536M is equipped with LED status indicators and supports a variety of programmable features including Line, Speed Dial, Busy Lamp Field, Bridged Line Appearance, Shared Call Appearance and Do Not Disturb.

Simplified Deployment: Sharing both power and signaling with the 5i Series phone, the 536M can be easily added without additional installation or wiring expense. Simplified configuration via WebUI or configuration file from the phone.

Expandability: Up to three 536M modules can be used with the 5i Series models 55i, 57i or 57i CT, offering up to 108 additional keys. Growing businesses can start with a single module and add more as their needs increase.