Patent ID: 6791976
Filing Date: 2004-09-14
Classification: H04W

Abstract:
A method for sending a burst of DTMF (Dual Tone Multiple Frequency) tones from one mobile station to another mobile station while a call is in progress comprising the steps of:establishing TFO (Tandem Free Operation) mode for this call; directing a first mobile station to transmit a burst DTMF digit or multiple DTMF digits; sending an IS-95 reverse burst DTMF signaling message from the first mobile station to a first TFO processor; extracting DTMF information from the DTMF signaling message received by the first TFO processor and forming a TFO frame containing this DTMF information; transmitting this TFO frame from the first TFO processor to a second TFO processor; sending a DTMF signaling acknowledgment message from the second TFO processor to the first TFO processor in a TFO frame; extracting the DTMF information from the TFO frame received from the first TFO processor by the second TFO processor and triggering the generation of an IS-95 forward burst DTMF signaling message; transmitting this message to a second mobile station; and generating DTMF tones based on the DTMF signaling message received by the second mobile station.