[Serusers] Load balancing with Mediaproxy

Hi everyone, I'm currently stuck at load balancing 2 ser with mediaproxy. I've setup the 2 DNS record in my master db.abc with ............ ser1.abc.net.my. IN A yy.yy.yy ser2.abc.net.my. IN A zz.zz.zz _mediaproxy._tcp.abc.net.my. ......... ser1.abc.net.my. _mediaproxy._tcp.abc.net.my. ......... ser2.abc.net.my. Both domains are pingable. What should be my next step? my present sip phones are all pointed directly to ser1.xx.xx.xx and ser1 is connected to remote db A. Do i still need to setup a virtual IP with heartbeat? What will be my sip setting at my sip phone? Also, what will be in my /etc/profile (export SIP_DOMAIN=??) Thanks in advance. peiyin