Lead Webex Dedicated Instance (DI) Architect

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

(Immediate Joiners are preferred)

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

Architecture Leadership & Governance

· 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.

Webex DI Platform & Call Control Architecture

· 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.

Migration & Transformation Leadership

· 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.

Integration & Hybrid Voice Architecture

· 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.

Required Technical Expertise

· 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

Certifications (Preferred)

· CCNP Collaboration / CCIE Collaboration

· Cisco Webex Calling / DI certifications

· Cloud architecture certifications (advantage)