Bug 911055 - [Dialer]DuT doesn allow to dial a <<pause>>

Hi @gabrielesvelto , I may be missing something here :) Take into account that in installHandlers() we need to check if there are tones to play after the call is "connected" to add the properly listener to play them ;) So if we do not want to make bigger changes and we do want to run getNumberAsDtmfToneGroups() more than once, we could add a last argument to installHandler() with the tone groups obtained in startDial(), something such as:
'''javascript
function installHandlers(call, number, emergencyOnly, oncall, onconnected, ondisconnected, onerror, dtmfToneGroups) {
  ...
}
'''