ALERT Suddenly No Ringback on Outbound Calls through Google Voice

[[email protected]]

Yesterday I suddenly get no ringback on Google Voice outbound calls. Extension to extension calls are fine. Today I finally set up an outbound route through our Flowroute and get ringback on these outbound calls. I had though previously it was in my PBX. Anyone else see this?
Asterisk 13.9.1
Incredible PBX 12.0.76.4
Centos 6.8 64 bit

 

[[email protected]]

FYI:
Reboots did not fix this. I retried several times. Eventually I went into the GUI, opened the Google Voice trunks one by one and simply clicked Submit on each and the problem went away. Weird.