Linux HA and Fault tollerence for SIP IPPBX

Hi , we are looking for a freelance Linux expert who can provide a turnkey solution for fault tolerence . The requirement is to set up 2 hardwaare servers with a virtual IP . A sip IPPBX application would run on the servsers . IP phoens are connected to the servers . if one of thye server fails the second should automatically take over without drop in call and zero downtime. Very urgent requirement , Must complete in 1 week from today . Handsome renumeration for sucessful delivery Please call +91 9845233336