GXW4216 is a next generation high performance high-density analog VoIP gateway that is fully compliant with SIP standard and broadly interoperable with VoIP systems, analog PBX and phones on the market. It features 16 FXS analog telephone ports, superb voice quality, rich telephony functionalities, easy provisioning, flexible dialing plans, advanced security protection, and excellent performance in handling high volume voice calls. The GXW4216 gateway offers small-to-medium businesses a cost-effective hybrid IP and analog telephone system that allows them to enjoy the benefits of VoIP communications while preserving investment on existing analog phones, fax machines and legacy PBX systems.