Hi Franco,
Unified Operations Manager is part of the Unified Communications Management Suite (UCMS). It does not do any billing applications for the charge questions below. Cisco has partners that handle billing applications for Unified Communications. Send email to ucmanager-pm-team@cisco.com for more info on billing partners.
Unified Service Monitor is another UCMS products that collects MOS scores and Service Quality information from the Communications Mananager and Sensors or Cisco NAMs in the network. It should be proposed, in addition to Unified Operations Manager, to address your last question. Please look here for more information on UCMS products.
http://www.cisco.com/en/US/products/ps5747/Products_Sub_Category_Home.html
Thanks for your question,
Jim Whitten,
Product Manager, UCMS @ Cisco