1. In a wireless telecommunications system having a packet-switched core network, a subsystem for conveying voice traffic within the telecommunications system from mobile devices that send uplink voice data using a circuit-switched protocol, the subsystem comprising: a memory storing computer executable instructions of: a user-plane translation module configured to: convert circuit-switched format uplink voice data into uplink packets, the uplink voice data originating from a mobile device that sends the uplink voice data over an air interface via a circuit-switched protocol; transmit the uplink packets to the packet-switched core network using packet-switched protocols; convert packet-switched downlink voice data packets into circuit-switched format downlink voice data, the packet-switched downlink voice data packets being received from the packet-switched core network using packet-switched protocols; and transmit the circuit-switched format downlink voice data to the mobile device via the air interface using circuit-switched protocols; and a control-plane translation module configured to: convert circuit-switched format signaling messages received from the mobile device into analogous packet-switched format signaling messages; and transmit the analogous packet-switched format signaling messages to a Session Initiation Protocol (SIP) voice control network using packet-switched protocols, wherein the user-plane translation module and control-plane translation module are associated with a controller component; and a processor configured to execute the computer-executable instructions.