An organization wants to integrate its Cisco Unified IM and Presence Server with Microsoft Lync for Remote Call Control. Which protocol standard does the integration use?

SAML SSO is an authentication and identity federation standard used for single sign-on, not for real-time call control or presence exchange.

XMPP is used for Jabber-to-Jabber federation and Cisco-native presence, but Microsoft Lync does not natively use XMPP for its federation or Remote Call Control integration.

LDAP is a directory access protocol used for user and group lookups, not for call control signaling or presence federation.

JTAPI is a Java-based telephony API used for CTI integration with CUCM applications, not for protocol-level federation with Microsoft Lync.

SIP/SIMPLE (SIP for Instant Messaging and Presence Leveraging Extensions) is the IETF-standard protocol used for interoperability between Cisco Unified IM and Presence and Microsoft Lync. The integration establishes a SIP federation trunk between the two platforms, enabling Remote Call Control so that Lync users can control Cisco IP phones via presence-based signaling over this protocol.

AXL (Administrative XML Layer) is a SOAP-based API for provisioning and administering CUCM, not a protocol used for runtime presence or call control integration.