[Serusers] Polycom IP 601 help needed

I have been given the task of getting a Polycom IP 601 running SIP v2.0.1.0291 to register with our SER proxy and be able to interact with our Asterisk server for voice mail. The Asterisk server currently sends unsolicited NOTIFY messages to turn on/off the message waiting light. Most of the configuration is working however I cannot get the phone to register with SER if I set the voIpProt.server.1.address to the SRV name of our SIP domain. The only way the phone will register is if I set this parameter to the IP address of our SER server which is something we do not want to do. Is there any way to make this phone perform a SRV lookup for the server address? Thanks,Steve