outgoing audio not working on windows or ipad

Hi everyone!!

Bit of an unusual problem (at least for me).  Joined a meeting a few days ago and found that nobody could hear me.  Did all of the usual, made sure I wasn't muted and tested the microphone settings in windows; everything was ok.  Now the really odd thing.  I tried using my iPad and had exactly the same problem!!  Any ideas appreciated as I'm all out.  I also tried rebooting the router, just in case........