Method and system for transmitting a data communication from a calling communication unit associated with a wireless communication system to a called communication unit

A method for transmitting a data communication from a calling communication unit associated with a wireless communication system to a called communication unit, the method comprising:

• establishing a first data channel between the calling communication unit and the wireless communication system, the first data channel configured to receive and transmit the data communication;
• after establishing the first data channel and before a second data channel has been established between the wireless communication system and the called communication unit, receiving by the calling communication unit a simulated connect message, the simulated connect message indicating that the second data channel has been established;
• and
• based on the simulated connect message, the calling unit transmitting the data communication via the first data channel.

A system for transmitting a data communication from a calling communication unit associated with a wireless communication system to a called communication unit associated with a landline communication system, comprising:

• a first data channel established between the calling communication unit and the wireless communication system, the first data channel configured to receive and transmit the data communication;
• a second data channel established between the wireless communication system and the called communication unit, the second data channel configured to receive and transmit the data communication;
• and
• an interworking unit associated with the wireless communication system, the interworking unit sending a simulated connect message to the calling communication unit after the establishment of the first data channel and prior to the establishment of the second data channel, the simulated connect message indicating that the second data channel has been established and the simulated connect message directing the calling communication unit to transmit the data communication via the first data channel.