It is recommended to upgrade this Avaya Product soon.
This product uses IP lines and SIP services to transmit the voice through the internet connection to the other party (data over the signal connection). Teltek’s Nebulosity Cloud PBX and Stratus Cloud PBX are systems which provide this service. We also can adapt analog devices (like fax) to our VoIP system.
The SL1100 Digital 12-Button Telephone is a sleek and stylish fit for any office. It offers four feature keys and navigation keys, plus a power-saving sleep mode to reduce environmental impact and energy usage.NEC SL1100 User Guide