Maintain service continuity for ISDN BRI handsets, gateways and fax devices without ripping out existing infrastructure. The Dialogic 901-012-09 TruFax board fits a PCI Express slot and exposes four B-channels through Dual Euro BRI interfaces, allowing voice and fax traffic to traverse existing circuits while you migrate to IP or modern PBX platforms. Designed for carrier-grade environments, the board offloads fax processing to TruFax hardware and integrates with SIP/TDM gateway stacks and media servers. Administrators keep control of call routing, signaling and fax reliability while reducing gateway load and minimizing downtime. Choose this module when you need predictable call capacity, proven BRI connectivity and an installed-base-friendly upgrade path that justifies the premium for integrated fax handling and production-grade reliability.