Improved dtmf signalling between mobile and server

Details Improved dtmf signalling between mobile and server Improved dtmf signalling between mobile and server

H - Electricity

04

W

H04W 4/20 (2009.01) H04W 4/12 (2009.01) H04L 1/00 (2006.01) H04M 1/50 (2006.01)

Patent

CA 2721661

In a method of processing an incoming sequence of one or more DTMF tones at a mobile device, the sequence is decoded to thereby identify any encoded message. Where the decoding does not identify a message, at least applying an error correction algorithm to the sequence to identify a message. Where the algorithm fails to correct the sequence, the sequence is compared to messages currently expected by the mobile device. If a message is not identified, a negative acknowledgement message may be sent. At a server, upon receipt of a negative acknowledgement message, it is determined if a message was sent to the mobile device in a previous pre-determined time window. If so, the message is re-sent. The server repeatedly sends certain messages to a mobile device until an acknowledgement message indicating receipt of the message by the mobile device is received.

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