The Audio/Video Conferencing Server cannot add Conferencing Announcement Service to a conference.
The Audio/Video Conferencing Server is not able to reach the Conferencing Announcement Service. This may be due to network connectivity issues or unavailability of the Conferencing Announcement Service. Conference Announcements in audio/audio-video conferences will be unavailable due to this issue. PSTN dial in users will be impacted, as they will be unable to exercise DTMF controls and other PSTN dial in conferencing functionality while in the conference.
Resolution=Please ensure network connectivity and availability of the Conferencing Announcement Service for the Audio/Video Conferencing Server to be able to function correctly. For additional information to troubleshoot the issue, please look at the events AVMCU_E_CAS_UNREACHABLE (Event ID: 32083).