Manager - Voice Application (FreeSwitch-Asterisk)

Ishan Group; Ahmedabad District; On-site; INR 650,000 - 1,000,000; Full time

Job summary

Ishan Group is seeking a skilled VoIP Engineer in India to configure, deliver, and maintain SIP trunking, contact centre, and PBX/telephony solutions from both the application and backend perspectives.

The role involves setting up hosted contact centre platforms, IVR design, call flow configurations, and ongoing troubleshooting to ensure high-quality VoIP service and uptime.

Qualifications

• Bachelor's degree in computer science, electronics, telecommunications, or equivalent.
• 2+ years of practical experience with Asterisk / FusionPBX / FreeSwitch / VICIdial or other telephony platforms.
• Certifications (if any): CCNA-Voice or CCNP-Collaboration preferred; relevant VoIP/networking certs are a plus.
• Technical skills include SIP, RTP, SRTP, WebRTC, TCP/IP, UDP; Linux CLI; IVR design and deployment; hosted contact centre platforms.

Responsibilities

• Configure and manage users, campaigns, and leads in a hosted contact centre platform.
• Create and deploy IVR menus and call flow configurations with audio prompts and routing logic.
• Customize and manage disposition codes, call outcomes, and agent workflows.
• Monitor and maintain contact centre platform performance and availability.
• Configure and maintain SIP trunks between Asterisk, SBCs, and third-party PBXs.
• Integrate SBCs with other VoIP systems (EPBX, CUCM, hosted PBX/dialer).
• Troubleshoot and debug call flow, SIP signalling, and VoIP issues.
• Monitor call quality using VoIP protocols and network fundamentals.

Skills

SIP

RTP

SRTP

WebRTC

TCP/IP

UDP

IVR design

Education

Bachelor's degree in CS / Electronics / Telecommunications

Tools

Asterisk

FusionPBX

FreeSwitch

Vicidial

Oracle SBC

Job description

We are seeking a skilled VoIP Engineer with hands‑on experience in Asterisk, FusionPBX, FreeSwitch, ViCIdial, SBC configuration, and hosted contact centre environments. The ideal candidate will be responsible for configuring, delivering, and maintaining SIP trunking, contact centre, and PBX/telephony systems from both application and backend perspective.

Key Responsibilities

• Configure and manage users, campaigns, and leads in a hosted contact centre platform.
• Create and deploy IVR menus and call flow configurations, including audio prompts and routing logic.
• Customize and manage disposition codes, call outcomes, and agent workflows.
• Monitor and maintain contact centre platform performance and availability.
• Configure and maintain SIP trunks between Asterisk, SBCs, and third-party PBXs.
• Perform integration of SBCs with other VoIP systems (e.g., EPBX, CUCM, or hosted PBX platforms/dialler).
• Troubleshoot and debug call flow, SIP signalling, and VoIP‑related customer issues.
• Monitor and ensure call quality using knowledge of VoIP protocols and network fundamentals.

Troubleshooting & Incident Resolution

• Diagnose and resolve VoIP call quality issues including jitter, latency, packet loss, and codec mismatches.
• Troubleshoot SIP signalling, RTP media path, and authentication failures.
• Perform root cause analysis (RCA) on recurring VoIP incidents and implement preventive measures.
• Coordinate with carriers and third-party vendors for SIP trunk and interconnect issue resolution.

Qualification & Experience

• Education: Bachelor's degree in computer science, Electronics, Telecommunications, or equivalent field.
• Experience:2+ years of practical experience with Asterisk / FusionPBX / FreeSwitch / VICIdial or other telephony platforms.
• Certifications (if any):CCNA-Voice or CCNP-Collaboration preferred; Relevant certifications in VoIP, Asterisk, or networking are a plus.
• Technical Skills:Asterisk, FusionPBX, FreeSwitch, ViCIdial; Oracle SBC / Session Border Controllers; SIP, RTP, SRTP, WebRTC, TCP/IP, UDP; Linux CLI; IVR design and deployment; Hosted Contact Centre platforms.
• Functional Skills:SIP trunk configuration and management; Call flow design; Contact centre administration; VoIP troubleshooting; Integration with EPBX and CUCM.
• Behavioral Competencies:Analytical and systematic problem-solving; Ability to work independently and under pressure; Good documentation skills; Strong coordination with cross-functional and vendor teams.