Which statement about SIP federation between Cisco Unified Communications IM and Presence and Microsoft Skype for Business is true?
Add the federated user as a contact in Jabber to view its presence status.
The role of SIP Proxy service is to process the XMPP packet in from Jabber and convert it to SIP.
TLS is optional.
Use of directory URI as an IM addressing scheme is not supported.
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