The GXW4224 is a next generation high performance high-density analog VoIP gateway that is fully compliant with SIP standards and broadly interoperable with various VoIP systems, analog PBX and phones on the market. It features 24 FXS analog telephone ports, easy provisioning, superb voice quality, flexible dialing plans, rich telephony functionalities, advanced security protection and excellent performance in handling high volume voice calls. It enables small to medium sized businesses to create a cost-effective hybrid IP and analog telephone system, which allows them to enjoy the benefits of VoIP communications while preserving investment on existing analog phones. fax machines and legacy PBX systems.