Phoebus alarms voice in a deeper, male voice and do not repeat. Despite being voice, they are not “Voice Alarms”. If it's an MPS Trip, check here.
Check an instance of Phoebus for the Alarm Table page, making sure it's the correct network
Take note of whether the alarm is MINOR, MAJOR, or INVALID
Right click on the alarm, then Data Browse to investigate
If need be, right click and then Guidance to find a contact person