In Avaya IP Office Server Edition, multiple servers (Primary, Secondary, and Expansion systems) communicate with each other to form a unified system. The protocol used for this inter-server communication is the Small Community Network (SCN) protocol, making Option C correct. SCN is a proprietary Avaya protocol that enables features like distributed hunt groups, call routing, and resilience across servers. Option A (H.323) and Option B (SIP) are VoIP protocols used for call signaling with endpoints or trunks, not inter-server communication in Server Edition. Option D (SNMP) is a network management protocol, not used for server-to-server coordination.References: Avaya IP Office Server Edition Reference Configuration Guide, SCN Configuration Guide.
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