i have one confusion related to call manager failover..i have one call manger 6.0 cluster at one of my customer. publisher ip is 172.20.30.2 and subscriber ip is 172.20.30.3 both are connected on one switch and dhcp is configured for issuing ip's for voice and data .. the dhcp config for voice vlan on switch is
ip dhcp pool voice
network 172.20.30.0 255.255.255.0
option 150 ip 172.20.30.2
according to above config 172.20.30.2 is ip of publisher, which will issue to ip phone via option 150 commnad and there is no configuration of subscriber ...what if publishers goes down, then how phone will look for subscriber whos ip is 172.20.30.3 ...