I have some ideas to resolve the concerns you have with the touch tones. First, may I ask what type of devices are been used? Most phones have the option to adjust the touch tone being put out by the phone. The setting is either a long tone or a short tone. In my experience different phone systems react differently to the length of the tone. If you reply with the phone models I will be more than happy to send you the instructions to change the settings and test further. Please let me know if I can assist with any other concerns.