Phone app stopped notifying me when I get new voicemail
I'm not sure why the phone app on my iPhone SE with the latest iOS (whatever version) stopped notifying me when I get a new voice mail. Before, say if I missed a call and a person left a voicemail, I would get a "ding" which would tell me to check the phone and listen to the voicemail (vs. if it's just some telemarketing that left no voicemail.) But now I don't get those audible dings anymore.
Can someone suggest how to set those up?
PS. Note that I do get a notification on the lock screen of a missed call and a voicemail. I just don't get an audible notification.