switch in the closet can support both voice and data services which is a significant savings over separate hard wired TDM connections for voice and data. Virtual Private Networking capabilities built into Avaya 9600-series phones means that companies with teleworkers may easily ship one of these phones to a remote location that has a cable modem or DSL Internet connection and with no manual configuration on the part of the remote worker the phone will securely connect back to the corporate network Call Router and Signaling Server and seamlessly make calling to the voice extension possible no matter where the phone is located. Caller ID, or Caller Identification is a phone feature that is able to display the phone number of the subscriber originating the voice call from the PSTN to the digital phone network such that the recipient is able to determine who is originating the call. See also Avaya Energy Saver Energy Efficient Ethernet References External links 9600 Series IP Deskphones Avaya