TUNNELING VOIP CALL CONTROL ON CELLULAR NETWORKS Russian patent published in 2018 - IPC H04L12/46 H04W76/20 

FIELD: electrical communication engineering.

SUBSTANCE: invention relates to cellular communication networks, in particular to transparent tunnelling of signalling from a mobile device through a cellular voice access network to the core Voice over Internet Protocol ("VoIP") core network. Tunnelled signals enable call control to be implemented in the VoIP core network and also establish a way to communicate requests, instructions, and call state. Signalling is transparent to the cellular network because that network does not receive and interpret the signalling. 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 (that is the caller-ID) encodes specific information. VoIP core network immediately releases the new cellular call once the caller-ID is received and the encoded information is interpreted.

EFFECT: technical result is enabling administration of multiparty calls, including conference calls and deferred calls, completely within the VoIP core network.

10 cl, 23 dwg