Hi!

This depends on the sip server only.   (unfortunatly, i don't know how Stanaphone work)

When somebody call you, smarter sipservers will route the call to all registered softphone. Not-so-smart sipservers will send only to the last registered softphone wich may result in random choices between your softphones.

With outgoing calls you should have no problems.

And, of course, the usage should remain free. You should be able to use your account from different locations at the same time.

Good luck in the voip world,

istvan