Aastra 675i Expansion Module 560M Headset The ESI E2 612 is

The ESI E2 612 is not compatible with the ESI CS-50 and CS-50L phone systems

Model: DV-1230S

The built in graphical display offers the time

An amplifier is required for the H series headsets because they provide functionality such as volume adjustments and more

and PoE devices

Aastra 675i Expansion Module 560M Headset The ESI E2 612 isAastra 675i Expansion Module 560M Description: The Aastra 675i expansion module provides support for additional programmable keys in an Aastra 675xi series IP phone. An additional 20 programmable keys are provided to a phone, and up to three expansion modules can be connected to a phone. Each button has a LED status indicator that can alert users to the status of lines or extensions in a busy lamp field (BLF) configuration. The Aastra 675i module is