How to register a SIP Phone to Cisco Unified Call Manager

[scottrichie]

I am running Cisco Unified Call Manager 6.1 and everything is working great; I have about 70 Cisco 7941 and 7961 Phones deployed.

I need to know how to register a non cisco phone running SIP. I have three Linksys WIP330 phones that I need to get working. The phone are connected to an access point and have an IP address that the Call Manager DHCP is assigning. I added a "Third Party SIP Device (Advanced)" and put it the MAC Address of a WIP330 phone and setup everything in CM.
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From Call Manager
Product Type: Third-party SIP Device (Advanced)
Device Protocol: SIP
Registration: Unknown
IP Address: Unknown
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The Phone says Registering and then Not Ready.....

Thanks for your help in advance!