glad to hear this! and yes my n900 will ring all numbers and voip-accounts I actively have! Plus Skype Msn etc. my phone at home rings for voice and shows xmpp messages, has an online phonebook looking up the name for unknown numbers calling me and so on (the list is endless).

Not to mention that my SIP provider offers prepaid without monthly fees and geographical number. for the US I got it in another way but for free as well.