In your attached document there is an example for the Mute Comand:
#12 Mute 5 M 0
It seems hat there have to be spaces between your command parameters.
Soinstead of
scriptresult =chr(35) +”D0"+ “DIAL1” + phonenumber + chr(13)
try
scriptresult =chr(35) +”D0 "+ “DIAL 1 ” + phonenumber + chr(13)
Not sure if channel 1 is correct, your attached document does not contain any information about this.