Voice channel control of wireless packet data communications

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, therebyobviating 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 remotewireless unit initiates a packet data session with the target destination.