No More Telephone Tag
A recorded message easily lets staff know when they're working.

My OR manager used to spend an hour every night calling all 20 OR staff members to let them know what time they were to report the next day. It would take her even longer to leave part-time staff voicemails about their start times. All of this was necessary, or so we thought, because we stagger shifts at our small facility to accommodate our surgeons, who perform cases between 6 a.m. and 4 p.m.