Oh, now I see what you're trying to do. You're looking to set a trunking policy based on the phone number/destination.
You can't do something that complicated with a Nokia phone (at least not yet). What you need to do is setup a server in the middle to do the trunking for you. Have a look at any of the many VoIP servers out there. You can go with something as simple as a SIP router (SER, OpenSER) to a full blown IP PBX (asterisk, callweaver, freeswitch, etc). Have a look at http://voip-info.org It's a great place to start learning.
The topology of your VoIP network would look something like this:
The VoIP Server will register with each of your phone accounts (and can even manage your voicemail, if you'd like), and your phone will register to your server. Trunking is a standard/trivial thing for VoIP servers, but you don't find that kind of functionality on VoIP clients.
Nokia phones ----> VoIP Server --┼------> Vyke