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in Pakistan

I am a Telecom Network Operation Engineer specializing in SMS infrastructure and global connectivity solutions. With deep expertise in SMPP, API/HTTP integration, DID sourcing, and SMS account management, I help businesses achieve seamless, secure, and high-volume messaging operations. What I Deliver: 1-End-to-end SMPP setup, configuration & optimization 2-API/HTTP connectivity for client integration and automation 3-DID sourcing & intelligent routing for reliable SMS delivery 4-Traffic monitoring, DLR analysis & latency control to ensure quality 5-Account provisioning, sender ID management & reporting 6-Secure, compliant, and scalable solutions for global messaging I combine technical precision with business-focused problem solving, ensuring every message is delivered fast, secure, and cost-effective. If you need a trusted NOC Engineer to manage your SMS operations and telecom connectivity, I’m ready to help you build a strong, future-proof communication system.

VoIP engineer with experience of more than three years in the SIP stack. Designing, deploying, and managing real-time voice systems for a contact center solution. Work on FreeSWITCH, FusionPBX, OpenSIPS, and Jambonz, and expertise in VoIP architecture, SIP signaling, and IVR design (conventional & conversational), and their HA deployments. Experienced in integrating open-source ASR/TTS engines. Adept in SIP debugging using Wireshark, sngrep, and Homer. Also experienced in recording solutions (SIPREC/BIB). Currently seeking challenging opportunities as a VoIP/SIP Engineer, where I can leverage my expertise in real-time communication systems, speech technologies, and infrastructure deployment to build scalable and intelligent solutions.

Reman Ali is VOIP and IT Professional with more than 5 year+ of in-depth knowledge & expertise in leading Cisco, Asterisk VoIP, Freeswitch, Vicidial and FreePBX. Vast experienced in the support and development of VOIP & telecommunications projects. Excellence communication skills with highest level of customer support. Diverse expertise on operating systems (Linux & Windows) and multiple CRMs.

I build, integrate, and debug VoIP and calling systems on Asterisk from a single SIP trunk to multi-tenant calling platforms. Whatever the calling problem is setup, integration, broken audio, or a full build I take it to production and document it for your team. What I help with: → Asterisk, Wazo, FreePBX, FusionPBX — setup, configuration, and production debugging → SIP trunking with any provider — Telnyx, Twilio, Plivo, Bandwidth → Inbound/outbound call routing, IVR, queues, CDRs, recordings, webhooks → Kamailio + RTPEngine — SIP routing and media bridging → WebRTC dialers & softphones — JsSIP, SIP.js, MicroSIP, Zoiper, Linphone → WhatsApp Business / Meta Calling — SIP gateway, DTLS-SRTP, ICE, RTP → NAT, codec, and one-way-audio troubleshooting on live SIP traces (sngrep, Wireshark) → Multi-tenant VoIP SaaS with REST API management → Voice AI & call-automation pipelines on top of SIP (LiveKit, agents) → Self-hosted on DigitalOcean, Azure, AWS — any Linux host Recent proof: I built multi-tenant WhatsApp Business Calling on a Wazo/Asterisk platform — a Kamailio → RTPEngine → Asterisk media bridge handling DTLS-SRTP from Meta's SIP gateway, with a WebRTC dialer, per-tenant routing, IVR, recordings, CDRs, and full API control. The client kept me on for ongoing work. I've also deployed self-hosted Asterisk on DigitalOcean with full trunk and dial-plan config — production, not a test lab. Tell me what you're building or what's broken, and I'll tell you straight if I'm the right fit. — Zahid

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 Astericom. 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, 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: Astericom, Twilio, VoIPdotms, Switch2VOIP, SignalWire, Anveo, Alcazarnetwork, voxbeam, Telus, RingCentral, Call Centric, Voyant (Vitelity), Nextiva, bandwidth, Altotelecom, FlowRoute, QuestBlue, sipdotus, DIDLogic, Nexmo, Plivo, siptrunkdotcom, 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, VoIPdotms, 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!!

Top Rated IT Infrastructure & Security Engineer with 700+ hours on Upwork and a 100% Job Success Score. I keep phone systems, firewalls, and servers running for small businesses and MSPs — so your team stays connected, protected, and productive. What I do: ✔ IT Support & Helpdesk — remote troubleshooting, ticket handling (Tier 1–3), user onboarding/offboarding, printer and endpoint issues, and ongoing support contracts for businesses and MSPs ✔ 3CX VoIP — new deployments, V18→V20 migrations, SIP trunk configuration (Twilio, Broadvoice), IVR, queues, DID routing, integrations, and troubleshooting ✔ FortiGate firewalls — SSL-VPN setup for remote teams, firewall policies, split tunneling, secure remote access, and web filtering ✔ VMware virtualization — ESXi and vCenter administration, VM provisioning, migrations (P2V/V2V), performance troubleshooting, and host maintenance ✔ Backup & disaster recovery — Veeam configuration, backup health checks, and restore testing for VMware environments ✔ Infrastructure & Information Security — network segmentation (VLANs), firewall hardening, VPN security, access control, MFA rollout, patch management, and security best practices to protect your business data ✔ Microsoft 365 & Intune — tenant administration, Exchange Online, device enrollment, and MDM policies ✔ Networking — network design & deployments, troubleshooting, and network optimization ✔ Server administration — Windows Server, RHEL/Linux, Active Directory, and day-to-day IT support How I work: I follow ITIL-aligned practices — structured incident and change management, proper documentation, and root-cause fixes instead of quick patches. Fast response times, clear documentation after every job, and plain-English updates — no jargon, no disappearing mid-project. I've handled everything from single urgent fixes to long-term support contracts, and my clients keep coming back because things get done right the first time. Let's talk: Message me with your issue — I'll tell you honestly whether I can fix it, how long it will take, and what it will cost. No overselling, no surprises.