Abhishek kumar K.Private profile: Upwork shows its earnings only to signed-in members, so we check it every few weeks, not daily. MRR here is a rough estimate (Upwork's six-month earnings ÷ months active). Last read Nov 5, 2026.

I help businesses build, integrate, and troubleshoot VoIP platforms, contact centres, and AI voice applications. My work covers telephony architecture, call routing, media handling, backend integrations, deployment, and production support. Whether you need a new PBX, a customised dialer, a browser softphone, or help resolving call quality issues, I can work across the signalling, media, and application layers. What I can help you with: • PBX and business telephony Installation, configuration, customisation, and support for Asterisk, FreePBX, FreeSWITCH, and FusionPBX. Features include IVR, queues, voicemail, conferencing, call recording, transfers, and inbound/outbound routing. • Contact centres and outbound dialers VICIdial and GoAutoDial deployment and customisation, predictive and progressive dialing, voice broadcasting, callback systems, agent workflows, and reporting integrations. • SIP routing and media OpenSIPS routing, SIP trunk integration, RTPengine, WebRTC, NAT traversal, and secure media. Troubleshooting for failed calls, one-way audio, missing ringback, registration failures, and call disconnections. • Voice AI and speech integration Connecting telephony platforms with AI voice bots, speech-to-text, text-to-speech, and real-time audio services. Experience includes UniMRCP integration, audio streaming, live voice translation, and transferring calls between bots and human agents. • Custom telephony development FreeSWITCH Lua scripting and ESL integrations; Asterisk dialplans; PHP, Perl, and MySQL development; REST API integrations; and custom call control workflows. • Deployment and infrastructure Cloud and on-premises deployment of PBX, contact centre, and softswitch platforms. Linux administration, Redis, RabbitMQ, HAProxy, VoIP billing integration, and PRI/ISDN/GSM gateway connectivity. My approach is practical: understand your call flow, review the existing environment, identify the underlying issue or requirement, and implement a solution that can be tested and maintained. I am available for project development, platform upgrades, troubleshooting, and ongoing technical support. Send me your current setup, the problem you are facing, or the call flow you want to build, and I can help define the next steps.