The IX78 has a unique and extensive SIP (Session Initiation Protocol) support. The IX78 handles global SIP based IP communication and allows usage of all SIP applications on the LAN and over the Internet. A built-in SIP proxy and registrar dynamically controlling the NAT and firewall, enables SIP communication between the private LAN and the Internet. This allows users behind the IX78 to utilize the full power of SIP based live IP communication, whether offered by service providers or by using the built-in SIP proxy and registrar as a stand-alone SIP server.
Two optional FXS ports allow analogue telephones to be connected and used as IP telephones. The IX78 may also include a gateway between SIP based IP telephony and the traditional telephony network via its FXO port. This gateway is useful for handling emergency “911” calls and for local back up for the IP telephony. In addition, it integrates calls received on the ordinary telephone line with the IP telephony system. Multiple SIP phones and soft PC SIP clients can also be connected to the LAN and become fully integrated with any SIP service.