Which service on the Presence Server is responsible for maintaining the point-to-point chat connections between Jabber clients?

Endpoint A is attempting to call endpoint B. Endpoint A only supports G.711ulaw with a packetization rate of 20 ms, and endpoint B supports packetization rate of 30 ms for G.711ulaw. Which two media resources are allocated to normalize packetization rates through transrating? (Choose two.)

When setting a new primary DNS server in the Cisco UCM CLI what is required for the change to take affect?

What happens to voice packets from a Cisco 8845 IP phone in the QoS trust boundary?

Which SNMP service must be activated manually on the Cisco Unified Communications Manager after installation?