[asterisk-users] Inbound route question

[Alejandro Cabrera Obed]

Dear, I have an Asterisk PBX with 3 SIP extensions (1000, 1001 and
1002) and a GSM Gateway with SIP extension 1111. Two cell phones call
to the GSM Gateway number and after that they get a ring tone to dial
to the SIP extensions.

Is it possible to consider the GSM Gateway SIP extension as an
incoming call to the Asterisk PBX and so create an inbound route that
point:

GSM Gateway DID: 1111 -> IVR

in order to point all incoming cell phone calls to my existing IVR ???

Thanks a lot.

Alejandro