SIPphone / Gizmo project recently changed their products to fully inter-operate with SIP Brokers * dialing convention.
See jefff's post:
http://forum.gizmoproject.com/viewto...0c69c2e8bf000b
Simply find the SIP-Code for the network you wish to reach in our
Network Directory and enter it into your phone followed by your friend's phone number. Your call will be connected, free of charge!