Avaya IX Calling Design 31860X mandates proficiency in architectural planning for Avaya Aura Communication Manager, Session Manager, and System Manager within enterprise VoIP deployments. Candidates must synthesize SIP trunking configurations, H.323 to SIP migration strategies, and high-availability topologies involving Avaya Breeze and Media Server integration. The curriculum prioritizes bandwidth capacity planning, QoS mapping, and fault-tolerant network design across distributed UC environments. Targeted at Network Engineers and Unified Communications Architects, this examination evaluates the technical capability to deploy scalable, secure, and resilient calling solutions while maintaining interoperability with legacy endpoints, public switched telephone networks, and heterogeneous cloud-based routing frameworks.