VoIP Developer at Ecosmob Technologies · Remote only · 3 - 8 years · Profitable · Remote only · Posted 12 Feb 2026
C++CAbout the Role:
We are looking for an experienced VoIP Developer to design, develop, and maintain enterprise communication systems. You will work with Kamailio, OpenSIPS, Freeswitch, and Asterisk to build scalable VoIP solutions.
Skills Required:
- Hands-on experience with Kamailio, OpenSIPS, Freeswitch, Asterisk
- Knowledge of IMS & Diameter
- Proficiency in C / C++ programming
- Strong understanding of TCP/IP, LAN/WAN, VLAN/L3 VPNs
- Good knowledge of SIP/SDP, RTP/SRTP, TLS protocols
- Experience with MySQL / MongoDB
- Understanding of Enterprise PBX features
- Problem-solving and debugging skills
- Good written and verbal communication
Nice-to-Have:
- Building softPBX, Voicemail, ACD, IVRS applications
- Experience with Python, PHP, Java, JavaScript
- Linux administration and command-line skills
- Knowledge of WebRTC, firewall, security
- Familiarity with tools like cmake and git
What We Offer:
- Remote / flexible work options
- Opportunity to work on large-scale VoIP systems
- Collaborative environment with skilled peers
Shubham Vishwakarma
Full Stack Developer - Averlon
About Ecosmob Technologies
About
Ecosmob is a fast-growing global IT company delivering innovative and integrated business solutions across diverse industries. Specializing in VoIP systems, mobile applications, e-commerce platforms, and web development, Ecosmob leverages advanced technologies such as PHP, Node.js, WordPress, and Joomla to provide customized solutions tailored to client needs. The company has a proven track record of delivering complex projects on time, helping businesses enhance operational efficiency and customer engagement.
With a client-centric approach, Ecosmob also offers consulting, offshore development, and technical support services to ensure seamless business integration. Its portfolio includes projects like 911 Notification Systems, Asterisk Billing Solutions, PBX in USB, Web Click2Call, and Fax over IP, among others. Committed to excellence and innovation, Ecosmob continues to expand its global presence, helping businesses achieve measurable value through technology and domain expertise.
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Ecosmob provides global IT solutions specializing in VoIP, mobile apps, e-commerce, and web development.
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Applications on this job are not being reviewed actively. You may apply but please follow up with the company via other channels too.
Key Responsibilities
- Design, configure, administer, and troubleshoot Cisco Voice and Collaboration environments.
- Hands-on experience with Cisco CUCM (Call Manager) administration, configuration, upgrades, and troubleshooting.
- Manage and support Cisco Unity Connection for voicemail and unified messaging.
- Configure and troubleshoot Ribbon SBC / PSX for SIP signaling, call routing, and voice connectivity.
- Troubleshoot SIP, RTP, TCP/IP, DNS, and voice call-flow issues.
- Configure and maintain Cisco IP Phones, gateways, trunks, dial plans, route patterns, translation patterns, and partitions/CSS.
- Monitor voice infrastructure and resolve incidents, service requests, and performance issues.
- Perform voice platform upgrades, patching, migrations, and production changes.
- Work with network, security, and application teams to resolve complex voice and connectivity issues.
- Maintain technical documentation, configuration standards, and operational procedures.
Required Skills
- Strong experience in Cisco Voice / Collaboration technologies.
- Cisco CUCM – Administration and troubleshooting.
- Cisco Unity Connection – Administration and troubleshooting.
- Ribbon SBC / PSX – Configuration and troubleshooting.
- Strong knowledge of SIP, RTP, VoIP, TCP/IP, DNS, and networking fundamentals.
- Experience with SIP Trunks, dial plans, gateways, route patterns, and call routing.
- Good troubleshooting and incident management skills.
- Exposure to monitoring tools and ITIL-based support processes is an added advantage.
Follow CutshortShubham Vishwakarma
Full Stack Developer - Averlon