Microsoft Technology Licensing, LLC

Eugen Pajor

John David Bruner

Mahendra D Sekaran

Jeffrey B Kay

Anish Desai

Ray Froelich

Vishal Vikram Ghotge

Shaun Douglas Pierce

Dhigha D Sekaran

Humayun Mukhtar Khan

Gursharan Singh Sidhu

Krishnan Ananthanarayanan

Amey Parandekar

Gursharan Sidhu

Eric S Hamilton

Kerry Woolsey

Mansoor Jafry

Frank Stephen Serdy, Jr

Reid Joseph Kuhn

John D Skovron

Ganapathy V Raman

Vijay Kishen Hampapur Parthasarathy

Tript Singh Lamba

Ramkumar Natarajan

Bayo Olatunji

Andrew Peter Schoorl

Humayun Khan

Eric Hamilton

Jeffrey Kay

John D Bruner

Mahendra Sekaran

Ganapathy Raman

Signaling from a mobile device is transparently tunneled through a cellular voice network to a Voice over Internet Protocol ('VoIP') core network so that multi-party calls, including conference calls and call waiting, can be managed entirely within the VoIP core network. The tunneled signals enable call control to be implemented in the VoIP core network and also establish a way to communicate requests, instructions, and call state. The signaling is transparent to the cellular network because that network does not receive and interpret the signaling. Instead, the cellular network's existing and unmodified control plane is repurposed by the mobile device by placing new, brief outgoing calls through the cellular network to the VoIP core network where the called party number (i.e., the caller-ID) encodes specific information. The VoIP core network immediately releases the new cellular call once the caller-ID is received and the encoded information is interpreted.

Tunneling VoIP call control on cellular networks

A mobile device utilizes a two-stage dialing solution when roaming on a visited mobile operator (MO) network to implement centralized routing so that a home network portion of a hybrid network is inserted into the path of outbound calls. A remote centralized routing (CR) service interoperates with a CR client on the mobile device. When a call is initiated to a remote party, the CR client calls into an arbitrary roaming routing number that is terminated in the home network. Once the call is connected between the mobile device and home network, the CR client sends a dialing string that includes a destination number of the remote party. The CR service calls the destination number and then bridges the calls to the mobile device and remote party to establish an end-to-end call path between the local and far ends of the call that traverses the home network.

Centralized routing in hybrid networks

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Eugen Pajor