To have a HD video peer to peer and conference call you have to run this and restart the FE Server Set-CsMediaConfiguration -Identity:Global -MaxVideoRateAllowed HD720p15m Enjoy!!!
Using power shell you can have a enabled user list of lync Get-CsUser | Select-Object DisplayName, Enabled, SipAddress | Export=Csv -Path C:\enabled user.csv Enjoy!!!!
Open logging tool and select component list S4 and SIPStack and before doing client to client communication start logging , After end of communication or Error Stop logging. and click Analyze log files Select Messeges windows and Read the right side description