The GXW4216/24/32/48 are fully compliant with SIP standard and interoperable with various VoIP systems, analog PBX and phones on the market. It features multiple FXS analog telephone ports, superb voice quality, a suite of telephony functionalities, easy provisioning, flexible dialing plans, advanced security protection and strong performance in handling high volume voice calls. The GXW42XX series gateways offers businesses a cost-effective hybrid IP and analog telephone system that allows them to enjoy the benefits of VoIP communications.