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An amplifier is required for the H series headsets because they provide functionality such as volume adjustments and more
the basic complement of 16 programmable keys can be increased to 38 or 60 keys for additional lines or access to powerful Meridian 1 features
The Panasonic KX-TA62477-3 is a 3x8 expansion module
The ESI E2 612 is not compatible with the ESI CS-50 and CS-50L phone systems
Model: DV-1230S
Aastra 675i Expansion Module 560M Headset An amplifier is required forAastra 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
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