When I first got my T-Mobile Curve (8320) and associated/connected up to my home Linksys WRT54G router (just using WEP)... I had a UMA connection, and voice/data connected just fine.
After switching from my 8800 to the Curve for day to day use, I noticed that I LOST the ability to do UMA at home... Wf-fi worked for data, but no voice capability... the Curve showed Wi-Fi logo and EDGE on the home screen..
Turns out something is the Desktop Manager Backup from the 8800 that I had restored to the Curve was causing the issue...
I didn't spend the time to trouble shoot because i'm on a BES which also does an over the air backup...
Net effect... If you are going from a previous Blackberry to the curve... Restore as little as possible to the curve... and get the rest on their via SYNC...
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