P/N 480-0062-00-14 1-5Chapter 1: OverviewCapabilitiesSelectNet™ Technology Safety Net (for Tenor AXM and Tenor AXE configurations)Quality of service is virtually guaranteed. Tenor AX ’s built-in patented SelectNet™ Technologyprovides a “safety net,” which virtually guarantees that each call going VoIP will not only be routedsuccessfully, but will deliver high voice quality.SelectNet monitors the IP network performance for VoIP calls. If the performance characteristicsbecome unacceptable—according to the delay, jitter, and packet loss specifications you configure—the Tenor AX will switch the call to the PSTN automatically and transparently. The Tenor continu-ously monitors your data network and transparently switches customer calls to the PSTN whenrequired.PacketSaver™ reduces bandwidth consumptionPacketSaver packet multiplexing technology reduces the amount of IP bandwidth required to sup-port multiple calls flowing between two endpoints. PacketSaver minimizes bandwidth usage byaggregating samples from multiple VoIP conversations and packing them into a larger IP packetwith a single IP header. The process removes the need to send a bulky IP header with individualvoice packets. As a result, it eliminates the transmission of redundant information.Figure 1-2 PacketSaverVirtual Tie TrunkThe Tenor unit can emulate any tie trunk. It provides all of the functionality of a tie trunk, includingthe considerable cost savings, but eliminates the need for a PBX trunk to be configured, or markedas a tie trunk. (A traditional tie trunk is a PBX-configured direct connection between two PBXs inseparate locations. The tie trunk bypasses the PSTN network, which results in considerable savings.)Your PBX does not need any additional configuration. The Tenor AX treats all trunks the same with-out compromising voice quality.Conventional VoIP Transmission Sends Many Redundant Packet HeadersTenor TenorTenor using PacketSaver to Minimize Bandwidth UsageTenor AX Tenor AXVoIPon www.voipon.co.uk sales@voipon.co.uk Tel: +44 (0)1245 808195 Fax: +44 (0)1245 808299