Edge Transport server
https://technet.microsoft.com/en-us/exdeploy2013/Checklist?state=2419-W-AABIEgEAQAA4AAEAAgAAgAA%7e
Setting up Edge Servers in Lync Server 2013
https://technet.microsoft.com/en-us/library/gg398147.aspx
Install Edge Servers for Lync Server 2013
https://technet.microsoft.com/en-us/library/gg398230.aspx
Exchange Server 2013 Hybrid Deployments
https://technet.microsoft.com/en-GB/library/jj200581(v=exchg.150).aspx
Deploying voice mail and UM
https://technet.microsoft.com/en-US/Library/jj673519