table look ups in accordance with known techniques upon receipt of the request to set up a telephone call by receiving gateway 102 a conventional circuit switched connection is established from gateway 102 to voice processing system 104 over circuit switched connection 106 b in accordance with standard and conventional telephony techniques after the call has been set up audio signals may then be transmitted to and from voice processing system 104 from telephone 103 over circuit switched connections 106 a and 106 b and internet 105 the audio signals may include voice and dtmf ones as well as signals representative of facsimile images fig2 shows a slightly more detailed diagram of the functionality of the gateway required in order to suppress dtmf tones the arrangement of fig2 includes the standard encoding and compression algorithms as well as logic to suppress tones in operation analog voice signals arrive from the public switched telephone network 201 and are converted to digital signals by analog to digital a d converter 202 the branch of processing comprising tone suspect and tone detection runs in parallel with the lower branch which comprises standard audio processing functions the digital audio signal is preconditioned by hi pass filter 205 echo canceller 206 and automatic gain control algorithm 207 the pre processed audio signal is then encoding using the standard.