Skype for Business, Dialing Terms of Service and NCOS Codes
This page contains Network Class of Service (NCOS) codes that describe restrictions that can be placed when dialing from Lync or Skype for Business.
NCOS settings are account/user specific and are requested by the Telecom Unit Coordinator (TUC).
All NCOS allow dialing to 911 for emergencies. None of the NCOS settings are able to dial 900 (per-minute fee) numbers.