Join us at Orange Business!
We are a network and digital integrator that understands the entire value chain of the digital world, freeing our customers to focus on the strategic initiatives that shape their business.
Every day, you will collaborate with a team dedicated to providing consistent, sustainable global solutions, no matter where our customers operate. With over 30,000 employees across Asia, the Americas, Africa, and Europe, we offer a dynamic environment to develop and perfect your skills in a field filled with exciting challenges and opportunities.

Role Overview

 

We are seeking an experienced L3 Voice Engineer responsible for deployment, configuration, migration, and commissioning of enterprise IP telephony and unified communication solutions. The role focuses on executing complex voice implementations, handling cutovers, ensuring high availability, and delivering stable go-live across multi-site environments.

 

Key Responsibilities

 

• Deploy and configure IP Telephony and Unified Communication solutions.
• Implement call routing plans, dial plans, and numbering schemes.
• Configure SIP trunks, PRI gateways, and analog gateways.
• Execute greenfield and brownfield voice deployments.
• Perform cluster build and integration with existing infrastructure.
• Configure and implement solutions of multi-OEMs.
• Configure SIP, H.323, MGCP protocols.
• Implement SRST for branch survivability.
• Configure CUBE for SIP trunk integration.
• Implement QoS for voice traffic across WAN.
• Plan and execute PBX to IP telephony migrations.
• Perform PRI to SIP trunk migrations.
• Execute change windows with minimal downtime.
• Prepare rollback plans and contingency procedures.
• Coordinate with telecom providers for circuit activation/testing.
• Integrate voice with:
  • Contact Center solutions
  • IVR systems
  • Call recording platforms
  • Active Directory / LDAP
• Conduct UAT, failover, and redundancy testing.
• Validate call quality (MOS), jitter, and latency.
• Prepare HLD/LLD and As-Built documentation.
• Create MOPs (Method of Procedure) for implementation.
• Conduct KT sessions for Operations (L2/L3 Support).
• Maintain IP addressing, dial plan, and device inventory records.
• Work with OEMs like Cisco Systems and Avaya, etc.
• Coordinate with ISP/Telecom providers for SIP/PRI provisioning.
• Support project managers during planning and execution phases.

 

 

Technical Skills Required

• SIP, H.323, MGCP
• Dial plan design & call routing
• CUBE configuration
• SRST configuration
• Voice gateway configuration (ISR/ASR)
• CUCM cluster deployment
• Unity voicemail configuration
• Jabber / Softphone deployment
• Basic Contact Center integration
• VLANs for voice (Voice VLAN)
• QoS (LLQ, marking, DSCP)
• WAN optimization for voice traffic
• Basic routing & switching understanding
• SIP security (TLS/SRTP – preferred)
• Certificate management (preferred)
• Access control & role-based administration

 

Experience Requirements

• 8–15 years of experience in enterprise voice environments.
• Experience handling multi-site rollouts and migrations.
• Experience in government or large enterprise deployments (preferred).

 

Certifications (Preferred)

• Cisco Systems CCNP Collaboration
• Cisco Systems CCIE Collaboration (preferred)
• Avaya Certification (ACIS/ACSS)
• Other OEM equivalent certificate

 

Key Competencies

• Strong execution capability during cutovers.
• Ability to work in critical change windows.
• Excellent troubleshooting and RCA skills.
• Clear communication with business stakeholders.
• Ability to mentor L1/L2 engineers.

Role Overview

 

We are seeking an experienced L3 Voice Engineer responsible for deployment, configuration, migration, and commissioning of enterprise IP telephony and unified communication solutions. The role focuses on executing complex voice implementations, handling cutovers, ensuring high availability, and delivering stable go-live across multi-site environments.

 

Key Responsibilities

 

• Deploy and configure IP Telephony and Unified Communication solutions.
• Implement call routing plans, dial plans, and numbering schemes.
• Configure SIP trunks, PRI gateways, and analog gateways.
• Execute greenfield and brownfield voice deployments.
• Perform cluster build and integration with existing infrastructure.
• Configure and implement solutions of multi-OEMs.
• Configure SIP, H.323, MGCP protocols.
• Implement SRST for branch survivability.
• Configure CUBE for SIP trunk integration.
• Implement QoS for voice traffic across WAN.
• Plan and execute PBX to IP telephony migrations.
• Perform PRI to SIP trunk migrations.
• Execute change windows with minimal downtime.
• Prepare rollback plans and contingency procedures.
• Coordinate with telecom providers for circuit activation/testing.
• Integrate voice with:
  • Contact Center solutions
  • IVR systems
  • Call recording platforms
  • Active Directory / LDAP
• Conduct UAT, failover, and redundancy testing.
• Validate call quality (MOS), jitter, and latency.
• Prepare HLD/LLD and As-Built documentation.
• Create MOPs (Method of Procedure) for implementation.
• Conduct KT sessions for Operations (L2/L3 Support).
• Maintain IP addressing, dial plan, and device inventory records.
• Work with OEMs like Cisco Systems and Avaya, etc.
• Coordinate with ISP/Telecom providers for SIP/PRI provisioning.
• Support project managers during planning and execution phases.

 

 

Technical Skills Required

• SIP, H.323, MGCP
• Dial plan design & call routing
• CUBE configuration
• SRST configuration
• Voice gateway configuration (ISR/ASR)
• CUCM cluster deployment
• Unity voicemail configuration
• Jabber / Softphone deployment
• Basic Contact Center integration
• VLANs for voice (Voice VLAN)
• QoS (LLQ, marking, DSCP)
• WAN optimization for voice traffic
• Basic routing & switching understanding
• SIP security (TLS/SRTP – preferred)
• Certificate management (preferred)
• Access control & role-based administration

 

Experience Requirements

• 8–15 years of experience in enterprise voice environments.
• Experience handling multi-site rollouts and migrations.
• Experience in government or large enterprise deployments (preferred).

 

Certifications (Preferred)

• Cisco Systems CCNP Collaboration
• Cisco Systems CCIE Collaboration (preferred)
• Avaya Certification (ACIS/ACSS)
• Other OEM equivalent certificate

 

Key Competencies

• Strong execution capability during cutovers.
• Ability to work in critical change windows.
• Excellent troubleshooting and RCA skills.
• Clear communication with business stakeholders.
• Ability to mentor L1/L2 engineers.

You bring rigor, passion for challenges, and determination. You seek the opportunity to expand your expertise, achieve your goals, and thrive.

• Global Opportunities: Work in multi-national teams with opportunity to collaborate with colleagues and customers from all over the world.
• Flexible Work Environment: Flexible working hours and possibility to combine work from office and home (hybrid ways of working).
• Professional Development: training programs and upskilling/re-skilling opportunities.
• Career Growth: Internal growth and mobility opportunities within Orange.
• Caring and Daring Culture: Health and well-being programs and benefits, diversity & inclusion initiatives, CSR and employee connect events.
• Reward Programs: Employee Referral Program, Change Maker Awards.

Regardless of your age, gender identity, race, ethnic origin, religion/belief, sexual orientation, marital status, neurotype, disability, veteran status or appearance, we encourage diversity within our teams because it is a strength for the collective and a vector of innovation. Orange Group is a disabled-friendly company and equal opportunity employer: don't hesitate to tell us about your specific needs.