What's the all steps if i need to call from number mobile by gsm to Asterisk server

Hello everyone
In my office i need to make call from gsm mobile to direct extension number like 300,
my information about lab:
. GSM device
. Asterisk server

  • extension, sip like 300
  • Applied trunk between asterisk server and gsm gateway so the statutes between them is ok.
    note :
    Am can make call from asterisk extension “300” to call direct to gsm mobile by used (prefix and matched pattern), and finally worked as fine without any problem.

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