My Customer have the following configuration/topology: It have 02 CallManger version 3.1.3, a one work Publisher and another Subscriber. It configured each callmanager to work with dhcp server. It is occuring the following problem: The Publisher the range is 10.0.1.1 up 10.1.1.125 mask 255.255.255.128 and Subscriber the range is 10.1.1.126 up 10.1.1.256 the same mask. When Publisher stayed down the IP Phones pass to register in Subscriber, but, when subscriber stayed down the IP Phones not change to Publisher. The problem can be a any configuration is Cisco CallManager or not?