slb real sipudp "server1" 172.16.30.189 5060 1000 sip-udp 3 3 60
slb real sipudp "server2" 172.16.30.253 5060 1000 sip-udp 3 3 60

slb group method "group1" sipcid rr
slb group member "group1" "r1" 1
slb group member "group1" "r2" 1

slb virtual sipudp "vip1" 172.16.30.171 5060

slb policy default "vip1" "group1"

sip nat 172.16.83.165 5060 172.16.84.252 5060 udp 60 callid
sip nat 172.16.83.165 5060 172.16.84.253 5060 udp 60 callid

sip multireg on