Abstract: Systems and methods for providing telephony services to an enterprise are shown and described. The method can include executing an application on a computing device external a mobile telephone network and interfacing the computing device to the mobile telephone network. The application provides PBX services to the enterprise. The method also includes generating, by the computing device external to the mobile network, a signal to provide at least a portion of a the PBX service on the mobile telephone network and transmitting the signal to a telephonic device connected to the mobile telephone network.

Abstract: Systems and methods for call routing are shown and described. The method can include receiving, at a site external to a mobile telephone network, an incoming telephone call via a first fixed line telephone number, signaling a mobile telephone network to initiate a call to the site external to the mobile telephone network, receiving a second incoming call from a mobile telephone of the mobile telephone network via a second fixed line telephone number, and connecting the first incoming telephone call to the second incoming telephone call to establish a connected call.

Abstract: Systems and methods for operating a business to provide telephony services are described. The method includes obtaining one or more mobile phone subscriptions for an enterprise and receiving via a web site a request for a subscription to one or more telephony services for the enterprise. The web site and the telephone services are operated independent of the operator of the mobile phone subscriptions. The method also includes linking the one or more of the mobile phone subscriptions of the enterprise to the telephony services via the website and generating a bill for the subscription to the telephony services on a periodic basis.