Patent ID: 8606256
Filing Date: 2013-12-10
Classification: H04L,H04M,H04W

Abstract:
1. At a mobile communications device server, a method of communicating with a mobile communications device served by said server, said method comprising: upon receipt of an indicator indicating receipt by said mobile communications device of an unrecognized message: sending a second message to said mobile communications device, said second message encoded by a particular unique sequence of DTMF tones wherein no sub-sequence of said particular unique sequence matches sequences or sub-sequences of tones encoding any other possible message such that said mobile communications device is able to identify said second message even if only a sub-sequence of said particular unique sequence is received; and sending a third message to said mobile communications device, said third message encoded by a further particular sequence of DTMF tones wherein one or more sub-sequences of said further articular unique sequence matches sequences or sub-sequences of tones encoding at least one other possible message but said third message is only sent after a sub-set of earlier messages such that said mobile communications device is able to identify said third message in context of earlier messages received.