Abstract: Systems and methods are described to use an inband signaling modem to communicate digital data over a voice channel of a wireless telecommunications network, while simultaneously maintaining the ability to support a voice conversation. An inband signaling modem receives digital data. A voice activity detector receives a digitized voice signal from a codec. The voice activity detector outputs an indication of the degree of confidence that speech is present in the digitized voice signal. If the indication denotes that speech is not present, the inband signaling modem encodes the digital data into audio tones. The synthesized audio tones are sent to a voice channel of a wireless telecommunications network. If the voice activity detector indicates that speech is present, the digitized voice signal is sent to the voice channel of a wireless telecommunications network.

Abstract: A data session with a wireless device ordinarily cannot be initiated from the network side because the wireless device has no predetermined IP or other network address. Methods are disclosed for instead causing the wireless unit to initiate a data session with a target destination, thereby obviating the IP addressing problem. A voice call is first initiated by a requester application to a remote wireless unit. The requester transmits a request message to the remote wireless unit via the wireless voice channel using in-band techniques; preferably including a payload in the polling message that identifies the target destination. In response, the remote wireless unit initiates a packet data session with the target destination.