Aastra 675i Expansion Module 560M Headset The 4242924L3 part number designates

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

Adtran 1200755E2 Features:

The IP5130-SDL features up to 9 lines and 20 programmable buttons

The phone is dual mode

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

Aastra 675i Expansion Module 560M Headset The 4242924L3 part number designatesAastra 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