This AT&T Small Business System is expandable to a 16-extension telephone system.The 1070 telephone is hearing-aid compatible and can be connected to up to four incoming telephone lines. This telephone features a speakerphone for handsfree use and a headset jack compatible with most two-band 2.5mm headsets. There are two additional ports available for connecting the telephone to another device such as a fax machine or modem.The 1070 allows paging, intercom and call transfers between system telephones and is capable of connecting three parties in the same conference call.This telephone also features a 32-number one- and two-touch memory for faster dialing and has a directory which can store up to 200 additional numbers with names.