Suggested Answer:A🗳️
An XMPP connection handles the presence information exchange and instant messaging operations for XMPP-based clients. Reference: https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/im_presence/configAdminGuide/10_5_1/CUP0_BK_CE43108E_00_config-admin-guide- imp-105/CUP0_BK_CE43108E_00_config-admin-guide-imp-105_chapter_00.html
Answer is C
According to this link: https://www.cisco.com/c/en/us/products/collateral/unified-communications/unified-presence/data-sheet-c78-729901.html
Fourth paragraph after "Product Overview": IM and Presence Service natively supports standards-based Extensible Messaging and Presence Protocol (XMPP) and SIP for Instant Messaging and Presence Leveraging Extensions (SIP/SIMPLE). As part of this dual-protocol capability, IM and Presence Service offers customers a choice of either rich-featured Cisco Jabber Unified Communications clients or any third-party XMPP-compliant IM and presence client.
A is correct. They are SIP devices from call processing perspective but from instant messaging and presence perspective they use XMPP. Question clearly states the we are asked for im&presence, not calling.
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