Color Expansion Module

for T43U/T46U/T48U IP Phones 

The EXP43 Expansion Module 

The CSS EXP43 Color Expansion Module for CSS T43U/T46U/T48U IP phones is designed to expand the functional capability of your SIP phone to a whole new level. It features a large 4.3-inch colour-screen LCD, giving you a vivid visual experience. In addition, it provides you with a simple user interface and advanced call-handling capabilities. For example, three pages of 20 flexible buttons shown on the display can be programmed up to 60 various features. The EXP43 will also extend the functionality of CSS T43U/T46U/T48U IP phones; you can set the provided multifunctional line keys as BLF, speed dial, call forward, transfer, call park, call pickup, etc. The CSS EXP43 Color Expansion Module is ideal for receptionists, administrative assistants and contact center workers. It allows you to monitor contacts and easily manage a large volume of calls. 

User-friendly Structure Design 

With a 4.3-inch colour screen, the CSS EXP43 expansion module intends to bring you a fresh visual experience and an easy operating experience. Its new design for the Stand enables you to adjust between two lying angles easily, even without disassembling it. A USB cable is chosen to connect the EXP43 expansion module to CSS T43U/T46U/T48U IP phones to ensure higher data transmission reliability and a higher data refresh speed. Moreover, after the connection between the expansion module and the IP phone is established, the remaining USB port on the back of EXP43 can also be used to realize the phone’s extended functions, for example, call recording via USB flash drive, etc. 

Intuitive Visualization 

A 4.3-inch 272×480-pixel colour screen greatly enriches your visual experience. The colour icons for DSS keys, the feature of Wallpaper and Screensaver offer you a new operating experience and allow you to customize the EXP43 in your own style. More than that, its three independent control buttons with illuminated LED are used for fast switching to the corresponding page.


 High Expandability

The CSS T43U/T46U/T48U IP phones can be fully equipped with up to three EXP43 Color Expansion Modules, adding 180 additional buttons. Three pages of 20 flexible buttons with dual-colour LED shown on the display can be programmed up to 60 features for speed dialling, BLF/BLA, call forward, transfer, etc. Thus, it will help you manage a high volume of concurrent calls, effortlessly monitor calls and significantly boost personal productivity. 



  • 4.3” 272 x 480-pixel colour screen
  • Colour icons for a rich visual experience
  • 20 physical keys on each page with dual-colour LEDs
  • Three independent control keys with illuminated LED for fast switching pages
  • Supports up to three daisy-chained modules
  • Stand with two adjustable angles