Conferencing Announcement Service could not negotiate TLS and failed to establish a SIP connection. Reason=%1. Front End=%2. ...

Lync Server 2010

Conferencing Announcement Service could not negotiate TLS and failed to establish a SIP connection.

Reason=%1. Front End=%2.
Cause: This issue may occur due to TLS certificates on the Microsoft Lync Server 2010 Front End and the Conferencing Announcement Service being expired, or not in sync.
Resolution:
Check and resolve certificate issues, mismatches between the Microsoft Lync Server 2010 Front End and Conferencing Announcement Service to restore connectivity.

Conference escalation failed because the existing party did not join the conference. Additional participants cannot be added. ... Conference rollover failed. Conference: '%1' MCU Type: '%2' Existing Mcu: '%3' Cause: Conference rollover occurs when an ... Conference session could not recover from route set failure because its signaling session or subscription session is already ... Conferencing Announcement Service configuration has changed. No Conferencing Announcement Service AOR currently available ... Conferencing Announcement Service could not negotiate TLS and failed to establish a SIP connection. Reason=%1. Front End=%2. ... Conferencing Announcement Service did not detect a private contact object. %1. Cause: Administration issues. Resolution: ... Conferencing Announcement Service lost connection with the Microsoft Lync Server 2010 Front End. Front End=%1. Cause: This ... Conferencing Attendant could not negotiate TLS and failed to establish a SIP connection. Reason=%1. Front End=%2. Cause: ... Conferencing Attendant did not detect a private contact object. Cause: Administration issues. Resolution: If the application ...