Why isn’t an end user s PC device in a QoS trust boundary included?
Refer to the exhibit An engineer is troubleshooting codec negotiation between two Cisco phones in different branch offices that connect over a WAN Which codec is used for the call?

An end user at a remote site is trying to initiate an Ad Hoc conference call to an end user at the main site. The conference bridge is configured to support G.711. The remote user ' s phone only supports G.729. The remote end user receives an error message on the phone: " Cannot Complete Conference Call. " What is the cause of the issue?
Exhibit.

Configuration of DNS is required to achieve a fully functional Cisco UCM system. Cisco UCM uses DNS to resolve fully qualified domain names to IP addresses for which destinations?