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.

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ip host losangeles.domain.com 216.82.225.202
ip host newyork.domain.com 216.82.224.202

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

sip-ua
sip-server dns:sipgroup.domain.com
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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..

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