[SR-Users] kamailio and virtual IP

Hi, I want to do this: 2 hosts, with 2 running kamailios, every host has 1 IP address and hostA has virtualIP assigned. kamailio should run on both hosts. I made a script which can transfer virtual IP from hostA to hostB. The problem is, I cannot tell kamailio to use virtualIP on hostB because, when I set listen=virtualIP:5060 - it cannot start because virtualIP is not present listen=0.0.0.0:5060 and force_send_socket(virtualIP) - it does not work as virtualIP is not in the listen list Some hint? I could run kamailio automatically after chaning IP address, but it requires time to load, so it will not be as quick as I change simply the owner of virtual IP. Thanks, Mino