[Nagual]

My voicemail sound and text message sound work, but when a call comes in my phone vibrates silently. (I've replicated this 10 times by now, and it happens after a phone reboot too.) I've made sure to check and the system/ring sound levels are both all the way up, and the sound I want plays normally when it's selected in Sounds in the settings panel.

What could be going on?