Help with installing a new switch for phones

We are troubleshooting a problem where nearly every morning all our VoiceEdge phones say "URL Calling is disabled".  Rebooting the Edgewater router usually fixes the problem after 5-10 minutes but we need a better solution. 

A Comcast engineer I spoke with suggested that our network switch connecting all our phones may be the problem (the Edgewater was replaced recently).  He suggested disconnecting the switch and see if the problem goes away:  impractical, since that brings all our phones down and the problem doesn't happen every day.

But we are planning to replace the switch.  My question is: is there a document or knowledgebase article somewhere that explains how I have to configure this brand new, out-of-the-box switch to support our phones?

Thank you.