Principal / Lead Webex Dedicated Instance (DI) Architect

Job Description

Job Title: Principal / Lead Webex Dedicated Instance (DI) Architect

Experience: 10+ years in Unified Communications / Voice / Collaboration technologies, with at least 5+ years of architecture ownership in Cisco Webex Dedicated Instance (DI) or large-scale CUCM-to-cloud transformation programmes.

Key Responsibilities

• Act as the Principal Architect and technical authority for Webex Dedicated Instance across transformation and BAU initiatives.
• Define target-state Webex DI architecture covering call control, clusters, regions, dial plans, PSTN connectivity, SBCs, survivability, and security.
• Establish architectural standards, reusable design patterns, and governance frameworks for Webex DI deployments.
• Own and approve HLDs, LLDs, migration strategies, dial plans, and integration blueprints.

• Architect and govern Webex DI CUCM clusters, including sizing, redundancy, geo-redundancy, and load balancing.
• Define global dial plan and routing strategies, including location-based calling, emergency services, and normalization.
• Design survivability and resilience models including SRST, local gateways, and redundant call routing.

• Lead large-scale migrations from on-prem CUCM (11.x and above) to Webex Dedicated Instance.
• Define migration approaches for:
• Users, devices, extensions, and DNs
• Voice gateways, trunks, and legacy integrations
• Call features (hunt groups, pickup groups, manager–assistant profiles)
• Drive phased, low-risk execution models aligned with enterprise change governance.
• SIP, PSTN & SBC Architecture
• Architect SIP and PSTN connectivity using Cisco CUBE, AudioCodes, or Ribbon SBCs.
• Design and govern AudioCodes SBC–based integrations for Webex DI, including SIP/TLS, SRTP, media interworking, and enterprise security controls.
• Lead integration of AudioCodes SBCs for Microsoft Teams Direct Routing, PSTN connectivity, and hybrid voice scenarios with Webex DI.
• Govern PSTN models including local gateway, cloud-connected PSTN, and direct provider integrations.
• Ensure secure signalling and media (TLS/SRTP), codec strategies, QoS, high availability, and end-to-end interoperability.

• Architect hybrid voice integrations with:
• Microsoft Teams (Direct Routing)
• Webex Calling and on-prem environments
• Contact Center platforms (UCCE / Webex CC)
• Define interworking designs between Webex DI, SBC layers, and enterprise WAN/LAN environments.

• Unified Communications Platforms
• Cisco Webex Dedicated Instance (DI)
• Cisco CUCM, CUC, IM&P
• Voice gateways and call routing
• Voice & Signalling
• SIP, SDP, RTP/SRTP
• PSTN architectures and emergency calling
• Dial plan design and normalization
• SBC & Network
• Cisco CUBE, AudioCodes, Ribbon SBCs
• WAN/LAN QoS, NAT, firewall traversal
• Hybrid cloud connectivity models
• Cloud & Integrations
• Webex Control Hub
• Microsoft Teams Direct Routing
• Integration with Contact Center platforms

• CCNP Collaboration / CCIE Collaboration
• Cisco Webex Calling / DI certifications
• Cloud architecture certifications (advantage)

Skills: dedicated instance,quos,ccie,sdp,cisco,ucp,cuc,integration,cube,cucm,connectivity,ccnp,design,sip,architecture,webex