Aastra 675i Expansion Module 560M Headset The phone is dual mode

The phone is dual mode

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

and PoE devices

The Panasonic KX-TA62477-3 is a 3x8 expansion module

The 4242924L3 part number designates that the Adtran Total Access 924e has built in VPN support

Aastra 675i Expansion Module 560M Headset The phone is dual modeAastra 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