No problem.
Get yourself amplified horns APH 5 with the power supply, they use two pairs; one pair goes to the horn 24 volts it feeds the coil in the horn, the second pair use another 24 volt DC power supply it goes to the voice in of the horn off of the same 24 volt DC power supply run a phone cable to the office install a phone jack and an analog phone.
Go off hook and page.