Cisco Unified Communications Manager IM and Presence Service provides which three features? (Choose three.)

IM and Presence Service supports XMPP-based open federation, enabling business-to-business and business-to-consumer communication with external domains. The service uses standard XMPP federation protocols so that users across different organizations can exchange presence information and instant messages without a private link. Both interdomain and intradomain federation scenarios are supported through this mechanism.

Call Admission Control is a CUCM feature that restricts call bandwidth across WAN links and is not a function of the IM and Presence Service.

Busy Lamp Field presence reflects the call state of a CUCM directory number on an IP phone and is managed directly by CUCM, not by the IM and Presence Service.

Instant messaging is a foundational capability of Cisco Unified CM IM and Presence Service, providing a client-independent platform for real-time text communication. Users can exchange messages within the organization and across federated domains using the XMPP protocol via a compatible client such as Cisco Jabber. This feature is a primary reason for deploying the IM and Presence Service node.

IM and Presence Service integrates with Microsoft Exchange Server to read a user's Outlook calendar and automatically update their presence status based on scheduled meetings. When a calendar entry marks a user as busy, their availability status reflects that state to contacts in real time. This integration requires configuring a connection between IM and Presence and the Exchange server.