Dial and make conference through the same dongle

Hi
I receive calls through dongle. (Raspberry pi)
When called dials a preferred number, I would like to dial another number using the same dongle and put them in conference.

This is normally possible using a mobile phone.

  • Incoming call received on dongle.
  • User select IVR option.
  • Need to put the same called on hold, dial another number using the same dongle and put them in conference.

Is this possible? Is it through “Custom applications” destination on IVR?

Regards
Eugene