G3 Failover Legacy Code - Note: From September 15th 2008 IP, Matrix, and Failover are all included in the price of all Tieline G3 Codecs. Codecs purchased prior to this date will require an upgrade fee to be paid for each upgraded codec. This software key will allow the codec to failover from one form of transport to another. (i.e. ISDN to IP, IP to POTS, etc....) Each codec will require this key if a Hot "active" failover is required.