My phone service will work with whatever resources that would be needed to support SIP calling natively. All SIP calls will go through SIP Broker, and will be in the format of 111 (to make a SIP Call) + SIP Broker Code (without *) + subscriber number. In addition, my phone service will provide a SIP address, and work with SIP Broker to get a SIP Broker Code. The call will come in as a telephone call, and you can choose to disable this feature.