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MCK Branch Extenders allow you add VoIP capabilities to your existing AVAYA, Nortel, NEC, Ericson or Alcatel PBX. MCK EXTenders allow you to add VoIP capabilities to your existing PBX. Extend the features and functionality of a central PBX to branch offices, call centers, retail locations, SOHO (small office/home office) workers, and road warriors. Leverage existing PBX infrastructure investments, centralize voice network administration, and enjoy dramatic monthly telecom savings with Citel's affordable, scalable EXTender/PBXgateway solutions.