The MCK CITEL Avaya Definity GATEWAY II (E-GWY2-SLM24, E-GWY2-SLM) 24 Port is MCK's most robust platform designed to support advanced business applications to be used by branch offices, call centers, home based call center agents and teleworkers. This new-generation gateway includes all of the features and functionality of the EXTender PBXgateway and more. The EXTender PBXgateway II is expandable in 24-user increments and terminates all of MCK’s client products.With MCK’s EXTender PBXgateway II, your remote workers can now enjoy all the features of the corporate voice system, enriched local calling and survivability. That’s because the EXTender PBXgateway II works over circuit- or packet-based networks and includes an optional T1/PRI/FR network interface card. The EXTender PBXgateway II can be configured to operate in either a managed IP network or a point-to-point synchronous WAN environment over traditional networks. In a traditional WAN environment, multiple MCK EXTender 7000 or 6000 for Branch Offices can be connected into a single EXTender PBXgateway II running serial RVP. The RVP relies on HDLC encapsulation over a serial port to transmit voice signals.