Assuming you want to call into SP1 from your cell phone:
Voice Services -> SP1 Service -> X_InboundCallRoute : {12341234567:aa,ph},{ph}
Voice Services -> Auto Attendant -> AnswerDelay : 20000
where 12341234567 is your cell phone number and 20000 milliseconds (20 seconds) is the delay for the AA to answer.
This should simultaneously ring the Auto Attendent and the PHONE Port when you call in from your cell phone. All other callers should ring the PHONE Port only.
Don't use Trusted Callers on the OBiTALK Web Portal. The OBiTALK Web Portal can't produce configurations such as this.
If you make these changes directly to your OBi, you must disable Auto Provisioning.
Note: The Auto Attendant delay is set to 20 seconds because if neither the PHONE Port nor the Auto Attendant answers within 25 seconds, Google Voice voicemail will take the call.
Should the simultaneous ringing of the PHONE Port and Auto Attendant not be convenient, you can always have your cell phone unconditionally go to the Auto Attendant and you can reach the PHONE Port from there by pressing option 1 (continue the call). Since the Auto Attendant will have answered, Google Voice voicemail won't be an issue. For this approach:
Voice Services -> SP1 Service -> X_InboundCallRoute : {12341234567:aa},{ph}
Voice Services -> Auto Attendant -> AnswerDelay : 4000 (Default checked)
where 12341234567 is your cell phone number.