Beginner: T23G Account Setup

[morlingit]

Setting up a T23G to connect to an enterprise Cloud Hosted VOIP service, but not sure what to enter in the Account config fields. VOIP provider has given me a user name (name@anyphone.com), a password and maybe the sip server/host name... sip.anyphone.com ???

Question is, what do I enter in these fields:
1. Register Name
2. User Name (is it just the user prefix not including the domain name?)
3. Server Host

Is it the Register Name that I'm missing? or...??

Any help appreciated...thanks

David