Nortel Meridian M8417 Two-Line Telephone (Black/Refurbished)Key Features: Two separate lines with station conferencing key Speakerphone with mute Personal Directory for 100 names and numbers Eight programmable memory keys for frequently called numbers or feature access codes Voltage Message Waiting indicator Redial key for last five numbers dialed Parallel line jack for extension fax or modem On hook dialing Compatible with Centrex PBX or standard telephone service Visual ringing extension in use hold