try using the command +vts to send DTMF signal, but the prob with this is it only takes in 0-9,#,*,A,B,C,D, so for a long sequence of numbers, eg 2093845, you will need to type in either of these two ways:
at+vts=2<CR>
at+vts=0<CR>
at+vts=9<CR>
at+vts=3<CR>
at+vts=8<CR>
at+vts=4<CR>...
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