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Which protocol is used between two Cisco IP phones once Cisco Unified Communications Manager Express connects a call?

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Which protocol is used between two Cisco IP phones once Cisco Unified Communications Manager Express connects a call?

Posted: Fri Jul 22, 2022 2:53 pm
by answerhappygod
Which protocol is used between two Cisco IP phones once Cisco Unified Communications Manager Express connects a call?

A. H.323
B. RTP
C. SCCP
D. SIP
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