I'm also having the same issue after upgrading from XLite4 to XLite5 have been using XLite4 on 20 users without issues. The compulsary upgrade was not nice. Anyway, what do I want for free
users did not know what was causing the noise ..... so thanks for this. I have just tested it on my phone and the minute I start pressing keys while on a call ...the noise starts.
The noise problem looks like it is solved by following the advice of heisert20, I have only tested it on my phone so far but it is now OK.
Tomorrow, Monday, I will alter the settings in DTMF for the other 19 in the office and see how we go.
Many thanks heisert20.