Salih M Musthafa
Bengaluru
Summary
Unified Communications Engineer with 8+ years of experience in Cisco UC (CUCM, UCCX, Unity Connection, Webex) and Webex Contact Center. Skilled in VoIP, SIP trunk configuration, PSTN integration, dial plan design, call routing, and SBC configuration. Proven success in multisite deployments, cloud migrations, and high‑priority incident resolution. Strong expertise in Cisco CUBE, Ribbon SBC, VMware ESXi, and Entra ID integration. Adept at delivering HLDs, LLDs, and MoPs for enterprise collaboration projects.
Overview
1
1
Certification
8
8
years of professional experience
Work History
Senior Technical Consultant
Orange Business
Bengaluru
11.2021 - Current
- Implemented and supported Webex Calling and Webex DI migrations, including Webex App and Cisco Jabber deployments, with SSO and OAuth integration using Entra ID, and administration through Webex Control Hub.
- Migrating legacy routing strategies to Business Hour configurations in Webex Contact Center.
- Deployed and maintained Cisco UC solutions (CUCM, UCCX, Unity Connection, IM&P, CUBE, SBC) across multi-site environments, including SRST implementation, PSTN migrations, SIP trunk, SIP Profiles for enterprise voice deployments.
- Collaborated with stakeholders, customers, and cross-functional teams to gather business requirements and deliver scalable Cisco UC and collaboration solutions across enterprise environments.
- Acted as a customer-facing technical consultant for UC deployments, migrations, troubleshooting, and solution design activities.
- Configured SIP trunks, PSTN integration, and dial plan implementation, ensuring reliable voice communication.
- Led UC migrations and upgrades with minimal downtime, improving system stability.
- Designed and documented HLDs, LLDs, and MoPs for enterprise deployments.
- Resolved CUCM and SIP call flow issues using RTMT, logs, and packet captures, reducing incident resolution time by 30%.
Voice Administrator
KPIT Technologies
Pune
04.2020 - 11.2021
- Administered Cisco IP telephony infrastructure, ensuring high availability across enterprise environments.
- Configured and troubleshot Cisco Expressway (B2B, MRA, video collaboration) for secure external communication.
- Provisioned and supported Cisco TMS, CMS, and Webex platforms, improving conferencing reliability by 25%.
- Managed UC certificates and performed disaster recovery activities, ensuring service continuity.
- Integrated Cisco IP Phones and endpoints into multi-site deployments.
- Configured SIP trunk, MGCP, and ISDN gateways for enterprise call routing and PSTN integration.
- Delivered UCaaS solutions via Webex Calling supporting hybrid collaboration environments.
- Troubleshot complex call routing, caller ID, and recording issues using SIP trace analysis and CUCM logs.
- Upgraded Cisco IOS on routers, enhancing security posture and system stability.
UC Engineer
Infinity Labs
Pune
03.2018 - 04.2020
- Analyzed CUCM, Expressway, CMS, and endpoint logs to provide RCA and improve system reliability.
- Assisted development of Python-based automation tools to detect data loss and generate real-time alerts.
- Tested and resolved B2B interoperability issues, supporting 50+ daily external calls.
- Managed incidents in alignment with ITIL processes, consistently achieving SLA targets and ensuring compliance with ITIL standards.
Education
B.Tech - Electronics and Communication Engineering
College of Engineering Thalassery
Kannur, Kerala05-2015
Skills
Collaboration Platforms
- Cisco Unified Communications Manager (CUCM/CCM)
- Cisco Unified Contact Center Express (UCCX)
- Cisco Unity Connection (CUC)
- Cisco Instant Messaging and Presence (IM&P)
- Webex CC
- Cisco Webex (Webex Calling, Webex DI)
- Cisco Expressway‑C & Expressway‑E (MRA)
- Cisco Meeting Server (CMS)
- Telepresence Management Suite (TMS)
- Cisco Room & Board Devices
Platforms & Virtualization
- Cisco UCS BE6K & BE7K
- VMware vSphere / ESXi
- Windows Server (2016/2019 – Active Directory, DNS, user management)
- Cisco Smart Software Manager (SSM)
- Entra ID (Azure AD), SSO, OAuth
Telephony & VoIP Technologies
- VoIP, SIP, H323, MGCP, RTP, TCP/IP
- PSTN, SRST, ISDN, SIP Trunk
- Call Routing, Dial Plan Design
- Call Flow Analysis
Infrastructure
- Cisco Unified Border Element (CUBE), Ribbon SBC
- Cisco Voice Gateways (ISR, C8200, CSR1000V)
- Routers & Switches
- Firewalls
- Infoblox DDI
Tools & Troubleshooting
- Wireshark
- RTMT
- TranslatorX
- CDR Analysis and Reporting (CAR)
- Fiddler Classic
- PuTTY
- Microsoft Visio
Design & Documentation
- High‑Level Design (HLD)
- Low‑Level Design (LLD)
Work Availability
monday
tuesday
wednesday
thursday
friday
saturday
sunday
morning
afternoon
evening
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Certification
CCNA Collaboration, CLCOR 350-800
Timeline
Senior Technical Consultant
Orange Business
11.2021 - Current
Voice Administrator
KPIT Technologies
04.2020 - 11.2021
UC Engineer
Infinity Labs
03.2018 - 04.2020
B.Tech - Electronics and Communication Engineering
College of Engineering Thalassery