Key expansion module</br>for Avaya 9611G IP Deskphone</br>9621G IP Deskphone</br>9641G IP Deskphone</br></br>Product Description</br></br>The BM12 button module extends the number of call appearances and feature buttons on your telephone. It provides 24 additional lines for incoming calls?? outgoing calls?? and calling features using two pages of 12 call appearances/features each.</br><br/>http://www.amazon.com/gp/product/B0093DFAMS