- You're enabled for Skype for Business public switched telephone network (PSTN) conferencing with Microsoft as the dial-in conferencing provider.
- While you're connected to a Skype for Business meeting through PSTN conferencing, you try to dial-out to a telephone number so that you can add another person to the meeting.
- The telephone number that you're dialing is in a country that's not in the following list:
- South Africa
- United Kingdom
- United States
For more information about where you can obtain PSTN conferencing, see the following Microsoft website:
Article ID: 3123657 - Last Review: Dec 21, 2016 - Revision: 1