what causes poor voice quality and video pixelization in a video call?

An administrator is integrating a Cisco Unity Express module to a Cisco UCME system A test call is placed to the Cisco Unity Express pilot number, but the administrator receives a busy signal.
The dial- peer is configured as follows:

How is this issue resolved?

Which protocol does prime collaboration Assurance use to poll the health status of different systems in the collaboration environment?

After an engineer implements the FAC and CMC features together, users report that calls take almost one minute to complete and that they occasionally hear the reorder tone Which two actions address this issue? (Choose two.)

Which two protocols does Cisco IM and Presence use to authenticate Jabber? (Choose two.)