Network Equipment Technologies has launched release 4.7 of its VX Series secure voice system, which provides enhanced transport of modem signals across the IP network and advanced call control using the US government’s multi-level precedence and preemption standard.

Network Equipment Technologies (NET) has said that release 4.7 adds new features such as: support for V.150 Universal Modem Relay. The V.150 capability, when combined with the VX Series’s existing ability to support TDM-based secure terminal equipment and secure communications interoperability protocol phones, enables instant interoperability between old and new technologies.

NET’s V.150 also includes the company’s Bestflow frame-packing technique, which allows VoIP to traverse firewalls, while providing bandwidth-saving capabilities and features that protect the reliability of secure telephony over IP, said NET.

NET’s VX Series Release 4.7 also includes support for the Department of Defense’s multi-level precedence and preemption standard (MLPP) implementation over both packet and circuit networks. MLPP allows call precedence values to be enforced when networks exhibit resource contention or bandwidth limitations. The latest release also provides session initiation protocol trunking for the PBX.