In CUCM, sip redundancy is provided by either route groups/route lists or srv records.
The only method for sip redundancy on CME systems are srv records.
ip host losangeles.domain.com 22.214.171.124
ip host newyork.domain.com 126.96.36.199
ip host _sip._udp.sipgroup.domain.com srv 1 50 5060 losangeles.domain.com
ip host _sip._udp.sipgroup.domain.com srv 2 50 5060 newyork.domain.com
ip domain lookup
ip name-server 10.3.0.1
ip domain name domain.com
This example will use los angeles all the time unless unreachable, then use new york,
If I were to set both priorities to 1, they would load balance. The 50 is weight, so you could set 60/40 or whatever..