There is a queue only message that can be accessed by dialing: *290.
When the voicemail prompt starts talking, press OK on your phone to finish the dialing sequence.
This message is used to tell customers when there is a higher-than-normal call volume and what place they are in, in line.
A valid message would be “We are experiencing a higher-than-normal call volume. Your call is important to us. Please stay on the line and your call will be answered by the next available technician.”
To disable (when volume slows), delete the message.