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I specialize in VoIP solutions with a focus on RingCentral (EX & CX) and Zoom (Phone & CC) project implementation and ongoing support. As a subject matter expert in the field, I work with businesses of all sizes to streamline communication systems, resolve complex technical challenges, and deliver seamless transitions to cloud-based telephony. Here's what you can expect when working with me: Deep Roots in VoIP: I'm not just certified; I'm passionate about what I do. With experience in RingCentral, Avaya, Zoom and Vonage, I'm well-versed in the intricacies of these platforms both in its UCaaS and CCaaS versions. Your Time Matters: I understand that every second counts in your business. That's why you can rely on me for prompt responses and effective solutions. Who I Serve: From small startups to large enterprises, I've had the privilege of assisting businesses of all sizes. My expertise spans various industries, including law firms, universities, fitness, and finance, to name a few. Here is a list of the most common tasks I perform within a VoIP platform: Call queues / Auto Attendant - IVR Call Forwarding / Call Routing Voicemail Setup / Custom Answering Rules Porting / User setup / Limited extensions SMS Automation** (10DLC) Multi Site Call logging expert / Audit trail Announcement / Audio greetings - Voice over Desk Phone Provisioning I'm here, ready to be your partner in enhancing your communication systems. Reach out to me here on Upwork and let's start a conversation, looking forward to understanding your unique needs and finding the perfect solution for you!

I am a senior VoIP Engineer with over 15 years of experience designing and deploying SIP-based telephony solutions. I have strong hands-on expertise with Asterisk, FreeSWITCH, Kamailio, OpenSIPS, Kazoo, and Jambonz, and I specialize in building reliable, high-availability VoIP systems for production environments. In addition, I have extensive experience integrating SIP call flows with AI voice agents over WebSocket, supporting real-time, bidirectional audio. I have built conversational voice bots end to end, including streaming STT, LLM-based dialog logic, and low-latency TTS, delivering natural and responsive voice interactions. I focus on scalable, secure, and low-latency solutions that bridge traditional telephony with modern AI-driven voice systems.

I specialize in Twilio development, including Twilio Functions, Twilio Studio Flow, and TwiML. I have extensive experience building SMS, Voice, IVR systems, call automation, and API integrations using Twilio. With 8 years of experience in automation and API integrations, I develop custom solutions that help businesses automate communication and streamline their workflows using Twilio. Specializations: 💬 𝐓𝐰𝐢𝐥𝐢𝐨 𝐒𝐌𝐒 & 𝐌𝐌𝐒 𝐈𝐧𝐭𝐞𝐠𝐫𝐚𝐭𝐢𝐨𝐧 Sending transactional and bulk SMS/MMS using Twilio APIs with delivery tracking and automation. 💬 𝐓𝐰𝐢𝐥𝐢𝐨 𝐖𝐡𝐚𝐭𝐬𝐀𝐩𝐩 𝐁𝐮𝐬𝐢𝐧𝐞𝐬𝐬 𝐀𝐏𝐈 𝐈𝐧𝐭𝐞𝐠𝐫𝐚𝐭𝐢𝐨𝐧 WhatsApp messaging automation, template messaging, and CRM integrations using Twilio WhatsApp API. 📞 𝐓𝐰𝐢𝐥𝐢𝐨 𝐕𝐨𝐢𝐜𝐞 𝐀𝐏𝐈 𝐃𝐞𝐯𝐞𝐥𝐨𝐩𝐦𝐞𝐧𝐭 Custom voice calling applications including inbound/outbound calls, call routing, and automation. 📲 𝐈𝐕𝐑 𝐂𝐚𝐥𝐥 𝐅𝐥𝐨𝐰 𝐃𝐞𝐯𝐞𝐥𝐨𝐩𝐦𝐞𝐧𝐭 Advanced IVR systems with DTMF input, call routing, business hour logic, voicemail, and callback features. ☎️ 𝐓𝐰𝐢𝐥𝐢𝐨 𝐀𝐈 𝐀𝐠𝐞𝐧𝐭 & 𝐂𝐨𝐧𝐯𝐞𝐫𝐬𝐚𝐭𝐢𝐨𝐧𝐚𝐥 𝐀𝐈 𝐃𝐞𝐯𝐞𝐥𝐨𝐩𝐦𝐞𝐧𝐭 Building AI-powered voice and messaging agents using Twilio integrated with AI models to automate customer conversations, lead qualification, smart responses, and support across voice, SMS, and WhatsApp channels. ⚙️ 𝐓𝐰𝐢𝐥𝐢𝐨 𝐒𝐭𝐮𝐝𝐢𝐨 𝐖𝐨𝐫𝐤𝐟𝐥𝐨𝐰 𝐀𝐮𝐭𝐨𝐦𝐚𝐭𝐢𝐨𝐧 Designing and implementing automated communication workflows using Twilio Studio. ⚙️ 𝐓𝐰𝐢𝐥𝐢𝐨 𝐒𝐈𝐏 𝐓𝐫𝐮𝐧𝐤 𝐂𝐨𝐧𝐟𝐢𝐠𝐮𝐫𝐚𝐭𝐢𝐨𝐧 Setup and configuration of Twilio Elastic SIP Trunks for VoIP systems and PBX integrations. 𝐓𝐰𝐢𝐥𝐢𝐨 𝐒𝐈𝐏 𝐃𝐨𝐦𝐚𝐢𝐧 𝐒𝐞𝐭𝐮𝐩 Configuration of SIP domains for secure voice communication and softphone connectivity. 𝐓𝐰𝐢𝐥𝐢𝐨 𝐅𝐥𝐞𝐱 𝐂𝐨𝐧𝐭𝐚𝐜𝐭 𝐂𝐞𝐧𝐭𝐞𝐫 𝐈𝐦𝐩𝐥𝐞𝐦𝐞𝐧𝐭𝐚𝐭𝐢𝐨𝐧 Deployment and customization of Twilio Flex for cloud-based contact center solutions. 𝐂𝐨𝐧𝐟𝐞𝐫𝐞𝐧𝐜𝐞 𝐂𝐚𝐥𝐥𝐢𝐧𝐠 & 𝐂𝐚𝐥𝐥 𝐌𝐞𝐫𝐠𝐞 𝐒𝐲𝐬𝐭𝐞𝐦𝐬 Building conference call systems with participant management and call merge functionality. 🔔 𝐂𝐚𝐥𝐥 𝐑𝐞𝐜𝐨𝐫𝐝𝐢𝐧𝐠 & 𝐓𝐫𝐚𝐧𝐬𝐜𝐫𝐢𝐩𝐭𝐢𝐨𝐧 Call recording implementation with transcription and storage for compliance and analytics. 𝐓𝐰𝐢𝐥𝐢𝐨 𝐖𝐞𝐛𝐡𝐨𝐨𝐤𝐬 𝐮𝐬𝐢𝐧𝐠 𝐏𝐇𝐏 Developing webhook endpoints to handle Twilio events, calls, and messaging workflows. 𝐀𝟐𝐏 𝟏𝟎𝐃𝐋𝐂 𝐑𝐞𝐠𝐢𝐬𝐭𝐫𝐚𝐭𝐢𝐨𝐧 & 𝐂𝐚𝐦𝐩𝐚𝐢𝐠𝐧 𝐒𝐞𝐭𝐮𝐩 Complete setup of brand registration, campaign approval, and compliance for US messaging. 𝐂𝐑𝐌 & 𝐀𝐏𝐈 𝐈𝐧𝐭𝐞𝐠𝐫𝐚𝐭𝐢𝐨𝐧𝐬 Integration of Twilio with CRM platforms like HubSpot, Zoho, Pipedrive, and custom APIs. Why doing API integrations? By doing software integrations, you automate your business saving thousands of dollars on monthly expenses. My experience brings to your operation less total cost. Looking forward to connect. Thanks Anil

Hi, I’m Faisal—a senior VoIP, CPaaS, and communications systems architect with 25+ years of experience designing carrier-grade, high-availability, real-time communication platforms. I build, scale, secure, and modernize voice and video systems for telecom operators, SaaS platforms, AI startups, CPaaS providers, and enterprises around the world. If it involves SIP, RTP, WebRTC, LLMs, Linux, CPaaS, or real-time media at scale, I can build it, optimize it, or rescue it. 🔑 What I Specialize In ✅ VOIP Platform Architecture (FreeSWITCH / Asterisk / Kamailio) ✅ Linux System Engineering, Security, and Optimization ✅ SIP, RTP, WebRTC, STUN/TURN, NAT Traversal ✅ Real-Time Communication (Voice & Video) at Scale ✅ AI-Powered Voice Bots, Transcription, and TTS Integration ✅ Troubleshooting SIP Call Flows, Packet Capture & Analysis (Wireshark/sngrep) 🔑 What I Do: VOIP & Real-Time Communication Architecture; FreeSWITCH / Asterisk / Kamailio / OpenSIPS platform design Carrier-grade SIP routing, NAT traversal, media handling High-availability + auto-scaling VoIP infrastructures Multi-tenant PBX, call center, and UCaaS platform development CPaaS Development & Integrations; Twilio, Plivo, Telnyx, Vonage, MessageBird Build SMS/voice/WhatsApp automation & workflows Replace/optimize expensive CPaaS architecture with self-hosted systems AI Voicebots, LLM Automation & Speech Tech (AI Integrations); Real-time voicebots using Whisper, Riva, Deepgram, Azure, ElevenLabs SIP → AI → SIP conversational call flows Real-time transcription + diarization + TTS pipelines LLM-powered call automation (ChatGPT Voice, RAG, custom models) WebRTC Application Engineering; Build custom WebRTC softphones (browser, React, Flutter) WebRTC signaling integration (SIP, custom protocols) TURN/STUN/ICE infrastructure setup QoS optimization for video/voice over WebRTC SIP Security, Hardening & Compliance; Anti-fraud protection, SIP scanning mitigation Fail2Ban, firewall tuning, SRTP/DTLS encryption STIR/SHAKEN setup & routing compliance Carrier-grade security audits & penetration checks DevOps for Real-Time Media Platforms; Docker/Kubernetes containerized VoIP workloads Auto-scaling SIP clusters, distributed media servers Monitoring with Netdata, Homer, Prometheus, Grafana CI/CD automation for telecom systems Outbound Dialers & Contact Center Systems; Predictive/preview dialers (custom-built or integrated) CRM telephony integration (HubSpot, Salesforce, Zoho) IVR, call routing, analytics dashboards Telephony Cost Optimization & Migration; Reduce Twilio/Telnyx billing by 40–70% Move from hosted CPaaS → self-hosted SIP infrastructure SIP trunk cost optimization strategies Emergency VoIP Platform Rescue; SIP call failure resolution One-way/no-audio fixes NAT, RTP, firewall, WebRTC troubleshooting 24–48h critical system recovery 🛠️ Tools & Stack VOIP Engines: FreeSWITCH, Asterisk, Kamailio, OpenSIPS Linux Distros: Ubuntu, Debian, CentOS, Alpine Protocols: SIP, RTP, SDP, SRTP, ICE, DTLS, WebRTC Monitoring: sngrep, Homer SIP Capture, Fail2Ban, Netdata DevOps: Docker, Ansible, Kubernetes (Cloud-Native VOIP) 🧠 Why Clients Work With Me 25+ years in telecom & VOIP architecture Built and scaled platforms like VdoTok using FreeSWITCH + WebRTC Performance-tuned Linux servers to handle millions of calls securely Helped startups and enterprises launch, scale, and secure VOIP stacks Expert in carrier interoperability, DID routing, and multi-tenant PBX 🧾 Sample Engagements 🔹 Migrated a legacy PBX to FreeSWITCH with SIP trunking and HA setup 🔹 Built a custom WebRTC softphone connected to Asterisk 🔹 Hardened VOIP infrastructure for international carrier with Linux + firewall tuning 🔹 Developed voice bot with NVIDIA RIVA and integrated it with SIP via FreeSWITCH 📞 Work With Me Whether you need to: Build a complete real-time communication platform Integrate AI voice bots into SIP/WebRTC Optimize or scale a VOIP system Reduce telephony costs Rescue a failing carrier-grade deployment 📞 Let’s Connect Whether you need to optimize your VOIP system, migrate to FreeSWITCH, or troubleshoot deep Linux-based issues, I can step in quickly and deliver solutions that scale and perform. 📅 I’m available for short consultations, full system builds, and long-term projects. Let me know when you're available for a quick Zoom or chat—I'm open Monday through Friday.

I am VoIP/VICIDIAL/VICIBOX/Asterisk/FreePBX/GoAutodial/vTiger/3CX developer and solution provider with past 16+ years of rich experience. I have expertise in them, and so i am confident to serve you for the same. I have rich telecom, web and custom software development and support experience. I'm interested in your job & I guarantee doing it in short time. I didn’t ask for an upfront as I'm interested in building long term relationships based on trust because I'm confident with my quality of work.

Hello, Thanks for visiting my profile. This is Abid Ur Rehman, a certified Asterisk Developer DCAP, VoIP Consultant, VICIDial, FreePBX SCE, 3CX v18 and v20 Certified Advanced Engineer, Elastix ECE, GoAutoDial, The SIP School SSCA, PBXWare, A2Billing, FreeSWITCH, Twilio, FusionPBX, ASTPP, Network CCNA, Windows Servers MCSE, and Linux RHCE certified expert. I graduated with a BS in Telecommunication and an MSc in Telecommunication Networks. Having over 13 years of VoIP/Linux/IT/network planning, design, development, deployment, optimization, administration, and support experience in top-notch organizations such as Telappliant Ltd., Cybergen, SCB Global, Dialer360, and Primo Dialer. Skills and Certification: IP PBX: 3CX, Asterisk, FreePBX, Elastix, PBXware MT, FreeSWITCH, FusionPBX, Issabel, VoIPOffice AI Agents/Integration: ElevenLabs, Vapi SMS Blast/Broadcast using SignalWire, VoIP.ms, Telnyx, Anveo, Bandwidth.com, Plivo, Skyetel, Twilio, VoxTelesys, BulkSolutions, Flowroute, Intelepeer, and BulkVS Telecom Billing: A2Billing, ASTPP, VOS3000, and Magnus Billing. Dialer: VoiceBroadcast, VICIDial, GoAutoDial, VICIBox Multi-Server Clustering, Dialer360, Primo Dialer IP Phones: Aastra, AND phone, Algo, AudioCodes, Cisco, Cisco/Linksys, CloudTC, Cortelco, CyberData, Digium, H-Tek, Incom, Intelbras, Konftel, Mocet, Norphonic, Obihai, Panasonic, Patton, Phoenix Audio, Polycom, Snom, Thomson, Unidata, Uniden, VTech, Xorcom, Yealink, Yealink/Dreamwave IP PBX (hardware): Sangoma PBXact UC / FreePBX, Elastix IP PBX, Grandstream UCM, Yeaster S-series, Renegadepbx-1U-Appliance-with-FreePBX, Patton's gateways VoIP Providers: USA and Canada: Twilio, VoIP.ms, Switch2VOIP, SignalWire, Anveo, Alcazarnetwork, voxbeam, Telus, RingCentral, Call Centric, Voyant (Vitelity), Nextiva, bandwidth.com, Altotelecom, FlowRoute, QuestBlue, sip.us, DIDLogic, Nexmo, Plivo, siptrunk.com, Telnyx, IDTExpress, Zadarna SMS and Bulk SMS: I can write code for you to send and receive SMS using any Asterisk and FreeSWITCH server and through popular providers like Telnyx, Twilio, Bandwidth.com, VoIP.ms, and SignalWire. For bulk SMS, I can set up a code with the front end for sending bulk SMS from a CSV . UK: Fuse 2, BT, VoIPTalk, DrayTEL, Telappliant, Gamma, sipgate, VoIPFone, VoiceFlex, Voicehost, Brightstar, Yellowgrid, Gradwell, T4com Ltd, Voxbeam, and Spitfire Linux Distros: CentOS, Redhat EL, Ubuntu, OpenSUSE, Debian, Back Track (Kali Linux) Windows machines: Windows Server 2012 and 2016, Windows Desktop 11, 10, 8, 7, and XP. Cloud Platforms: AWS EC2 and LightSail, GCP, Vultr, BlueHost, HostGear, Hetzner, and Digital Ocean Coding: PHP, MySQL, Lua, XML, JSON, HTML I would be very happy to assist start-ups as well as SMEs in achieving their goals and business objectives. Thank you!!