Which method can be used to correct database replication issues in a cluster running Cisco

Unified CallManager 5.0?

You have received a trouble ticket stating that users in accounting are not able to use the CFwdAll
softkey to forward their calls to voice mail. Their phones continue to ring when they receive
inbound calls, even after they have pressed the CFwdAll softkey and the Messages button. What
is a possible cause of this issue?

You have placed all DNs in the Phones partition. During testing you discover that you cannot place
calls between IP phones, but you can place calls to the PSTN and voice mail. What is one
possible cause of this issue?

You have received a trouble ticket stating that the MWI light is not coming on for a group of users.
Further investigation reveals that the affected users are connected to the same subscriber in the
cluster. Users that are connected to other subscribers in the same cluster are not experiencing this
issue.
What is causing this problem?

How does the echo canceller interpret a signal when the ERL value is too low?

Three calls can successfully be made across a WAN link. When a fourth call is made, the quality
of all four calls degrades. Which QoS mechanism can help avoid this problem?