Hi Richard,   the "default" traffic shaping rules were not there before, therefore we had to create them manually.   Cheers, Ben ... View more

The image shows as broken in your message ...   With 11 simultaneous calls using G711 you'll need around 1Mb/s of bandwidth.  Have you got that much available on your upstream?   You will also want to measure you upstream capacity (using something like www.speedtest.net) and configure your WAN links to that speed, and then give the VoIP traffic priority. ... View more

I think your issue sounds like it could be related to UDP timeout which you cannot change on the Meraki.  You could try changing the timeout on your Avaya system to be longer though.  Too much jitter would more likely cause poor audio quality, but not phones re-registering like you describe. ... View more

Terrific thanks for needed clarification ... View more