Creating an Inbound route for GSM module

Dear All,

How can I define a Incoming route in Freepbx, that routes calls received by GSM module to a SIP user.

How can I specify the incoming routes that it should handle calls to SIM card on GSM module,
I have created an incoming route that does not specify anything but the destination,

Nothing happens when I call the number of SIM card.

I have asterisk, freepbx 2.8.1, with GSM card
I have already tested the GSM module, it works fine, the dahdi driver and all.

Without Freepbx, I could write a (answer, dial(SIP/100), Hangup) dial plan in extensions.conf in [from-gsm].

How can I configure Freepbx to do the same behaviour?

Thanks for your time,