Hire the best SIP specialists

Check out SIP specialists with the skills you need for your next job.
Clients rate SIP specialists
Rating is 4.8 out of 5.
4.8/5
based on 247 client reviews
  • $150 hourly
    A Top-Rated, Expert-Vetted VoIP/Software engineer with over 20 years of experience. My experience ranges from Asterisk/FreePBX phone systems, SMS messaging, Linux operating systems, to network administration. I believe you deserve a more professional, reliable, and personalized business experience, and I bring that mindset to every project. Whether I’m developing top-secret code for Lockheed Martin, or AI telephone agents for Nomo, or creating privacy-first communications for Mecca Hosting, Inc, or designing secure, high availability Asterisk systems for TeleConnx Inc., or handling difficult troubleshooting tasks, I always commit myself to the same standard: creative, client-first solutions and efficient, high-quality work, completed in a fraction of the time. I have a passion for transforming mundane phone interactions into exciting customer experiences, and I lean on decades of experience to create solutions that others would find impossible. In short, I can make your telephone system do pretty much anything, including turning on your coffee maker in the morning. I look forward to working with you!
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    FreePBX
    MySQL
    Kamailio
    Linux System Administration
    Amazon Web Services
    VoIP Administration
    Asterisk
    API Development
    C
    VoIP Software
    LAMP Administration
    Session Initiation Protocol
    Linux
    VoIP
    Business with 10-99 Employees
  • $75 hourly
    I have over a decade of VoIP networking experience deploying and configuring iPBX's (3CX, ShoreTel), Skype for Business/Lync, Session Border Controllers and Gateways (AudioCodes, Sonus, Edgewater). My experience ranges from complete project management to individual SBC/GW implementations. My core focus has been VoIP connectivity and the applications that accompany it like Call Recording (Cloud & On-Premise), Office 365 and Exchange. The vast majority of my time has been spent implementing on-premise systems (60%) and hosted systems (40%) for small and medium businesses. I have interfaced with Tier-1 Carriers, (ATT, Verizon, Centurylink, Level(3)) all the way down to pure SIP based service providers such as (G12, Flowroute, PureIP).
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    Phone Communication
    IT Management
    VoIP Administration
    3CX
    Session Initiation Protocol
    Skype For Business
    Network Engineering
    Network Planning
    Network Design
    Network Monitoring
  • $50 hourly
    I am trying to get ahead here doing some jobs; I have 15+ years of expertise. Making good installations and debugging of VOIP Devices and OS, also Setting up IP PBX gateways such as Elastix, Asterisk, Freeswitch, FreePBX, VOS3000, A2Billing, ASTPP, 3CX, OpenVBX, and Kazoo, also SMS Systems Like PlaySMS, Jasmin, and Kannel. If you give me the job, I'll make it a success 100%! 3CX certified! I have a good knowledge of: PHP, MYSQL, HTML, CSS, WORDPRESS, JAVASCRIPT, VPN, CLOUD COMPUTING, UNIX/LINUX ADMINISTRATION, WINDOWS ADMINISTRATION, HOSTING SERVERS ADMINISTRATION, UBIQUITI, MIKROTIK, CISCO, Repair of the older tube TV :).
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    VoIP
    Asterisk
    VoIP Administration
    Twilio API
    MySQL Programming
    Session Initiation Protocol
    SMS Gateway
    Database Optimization
    Network Engineering
    FreePBX
    3CX
    Linux System Administration
    FreeSWITCH
  • $70 hourly
    I am consistent "Top Rated Plus" VoIP Developer on Upwork with numerous 5 star reviews including excessively positive feedback. 12+ years of experience in Custom VoIP Software Development. I have provided a wide range of IT solutions, including VoIP Development, Websites & Mobile Apps development for international businesses and start-up companies as well as for large enterprises. 🏆 Following are my area of experiences: ✓ VoIP / SIP / RTP ✓ OpenSIPs / Kamailio / OpenSER ✓ FreeSWITCH, FusionPBX, ASTPP, Lua Scripts ✓ Asterisk, FreePBX, A2billing ✓ RTPengine / MediaProxy / RTPproxy ✓ Twilio ✓ Linux & OpenSource Consulting ✓ MariaDB, MySQL, PostgreSQL (Database design & complex SQL query expert) ✓ PHP, Yii/Yii2, Apache, Nginx ✓ Android 🏆 I provide the following solutions: ✓ High scalable Least Cost Routing(LCR) with Fail-Over ✓ Session Border Controller(SBC) ✓ Click to call ✓ Class4 & Class5 Soft Switches ✓ SIP Proxy Server, SIP Load Balance & Fail-Over ✓ SIP Messaging Server, SIP Redirect Server ✓ IVR Application ✓ Fax over IP (FoIP), T38 Supported FAX Server, FAX to Email ✓ Shoutcast Server ✓ WebRTC SIP client ✓ PHP RESTfull API, Web Services for Mobile Application ✓ Web Applications ✓ Mobile Applications. My core competency lies in complete end-to-end IT solutions for VoIP, Web, and Mobile technologies. 👤 Reviews & feedback given by clients for successfully completion of largest projects ⭐⭐⭐⭐⭐ "Malay is an excellent VoIP expert and was able to do any task we could throw at him. Will be using his services again shortly as our go-to VoIP expert." ⭐⭐⭐⭐⭐ "Excellent at meeting deadlines. Outstanding at changing work hours to conform to my requirements. First-rate productivity levels. Extremely good communication and ability to explain and brainstorm in a group environment. Admirable at working with other random developers I brought into the project throughout the years. Malay and his team at Prayantech were able to tackle any task I through at them from Asterisks, FreeSwitch, Python PHP HTML JS Debian RHEL IP Tables working inside of multiple different cloud hosting environments his understanding of VPN and firewall security are excellent. I can’t say enough good things about this group I am certain we will be working together as a team for many years to come." ⭐⭐⭐⭐⭐ "Malay and his team were great to work with. Once we got in a flow, we were able to bring something to life I could not have done without him and his team. He was extremely aware of timelines and making time for our project during our "open hours" and working around the time change. Thank you Malay! Keep up the great work and I look forward to working with you soon!" ⭐⭐⭐⭐⭐ "It was a pleasure working with Malay. Very professional and to the point. they don't waste time and they want to finish your project as much as you want to."
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    MySQL
    OpenSIPS
    FreeSWITCH
    Yii
    PHP
    Kamailio
    Yii2
    API
    VoIP Software
    Asterisk
    MariaDB
    Session Initiation Protocol
    Linux System Administration
    Database Administration
    VoIP Administration
    VoIP
  • $55 hourly
    There is some feedback: - Pavel was fantastic! My project hit a snag and I needed an FTP server configured quickly. When I couldn't complete the task myself, I asked for help. Pavel jumped in immediately and had me fixed in no time and friendly answered all my questions. This guy is a real problem solver! - Very smart when it comes to Linux systems, was able to help with our issue. - Very skilled and professional expert who solved all additional and unexpected problems with patience. He overdelivered and I can highly recommend working with him! - The problem was solved quickly and efficiently. - Pavel did a great job tracing the problem and solving it - Pleasure to work with. Skilled system administrator and network engineer with 18 years of hands-on experience. Know how to organise network in one office or in several offices connected via vpn. Unix system administrator, with a lot of experience in Linux and BSD distributions.. I have got working experience with: DNS; DHCP; LAMP-LEMP; FTP; SMTP; SNMP; ACL, firewalls and NAT; I have experience with cloud services (AWS, GCE, Vultr, DigitalOcean) and virtual infrastructure (vSphere, Hyper-V, Proxmox); I have got working experience with Monitoring (Zabbix); VoIP/IP telephony (Asterisk,FreePBX).
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    Asterisk
    DNSsec
    WordPress
    Linux System Administration
    Firewall
    Apache Administration
    MySQL
    LAN Administration
    Session Initiation Protocol
    Squid
    Web Hosting
    Network Engineering
    VMware vSphere
    NGINX
  • $90 hourly
    • CCNP Collaboration • Configure and troubleshoot Cisco Webex Calling • Transition customers from on-premise to Cisco Webex Calling • Extensive experience and training in designing, installing, and troubleshooting Cisco Unified Communications Manager, Unity Voice Mail, Unified Contact Center Express and other applications, Voice Gateways, and IP Phones • 3 years configuring, troubleshooting, and transitioning customers to Cisco Webex Calling • 22 years of configuring, troubleshooting, and testing Cisco Unified Communications Manager (CallManager) and other Cisco Applications • 24 networking experience • 24 operating system and Microsoft application experience • 24 years of project management experience • 24 years of installing, configuring, maintaining, and troubleshooting Cisco routers and switches
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    Cisco Certified Network Associate
    Cisco Certified Network Professional
    Session Initiation Protocol
    Cisco UCS
    VoIP Administration
    Cisco IOS
    Cisco Router
    Cisco CallManager
    VoIP
    Network Administration
  • $75 hourly
    ✅ Microsoft Teams, Telephony and Teams integrated Contact Centers (Luware Nimbus) ✅ M365 service design, migration ✅ Intune ✅ Defender ✅ Azure, Azure AD ✅ Powershell ✅ Terraform ✅ IT Networks, DNS, Certificates ✅ VoIP gateways (AudioCodes, Sonus/Ribbon SBCs) ✅ Skype for Business ✅ Exchange ✅ Active Directory, ADFS Certifications • MCSE: Productivity Solutions Expert • MCSA: O365 • ITILv3 Foundation • Microsoft 365 certified: Teams Administrator Associate (MS-700) • Microsoft 365 Certified: Teams Voice Engineer Expert (MS-720) • Microsoft 365 Certified: Collaboration Communications Systems Engineer Associate (MS-721) I'm a seasoned IT Consultant with 10+ years of professional experience in the IT industry. Acting as an IT partner, providing expert guidance and support in various areas of information technology, including Microsoft 365, Azure, Networks, IT Infrastructure, Teams Telephony, Project Management, IT Infrastructure, Endpoint management and Security. Key responsibilites: Consultation Solution Design and Implementation Technical Support and Troubleshooting Security and Data Protection Training and Documentation Vendor Management Stakeholders Management Project reporting
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    Microsoft Endpoint Manager
    Microsoft Office
    IT Project Management
    Microsoft Teams
    VoIP Administration
    Skype For Business
    Project Engineering
    Microsoft Exchange Online
    Computer Network
    Office 365
    Microsoft Windows PowerShell
    DNS
    Microsoft Exchange Server
    Windows Server
    Microsoft Active Directory
  • $25 hourly
    I am here with 12+ years of high experience specialised in creating applications from scratch and improvising the existing applications placing my feet parallel to present-era technologies. Innovation and hard work are my forte. I work to craft the best Android and iOS applications for my clients. For me, my customers are my family. I work for complete satisfaction and deliver a product that helps to outpace the rest of the crowd. I believe in bringing the best to my customers; I follow a well-defined and strategic process that is shared whole-heartedly with my clients. My development experiences: - Social networking apps - Chatting apps - Taxi apps like Uber - Food delivery apps - Phone/Video sharing apps - Travel apps - Health/Fitness apps - Communication apps - Medicine apps - Location tracking apps - Driving apps - Delivery apps and interested to enter the world of new apps My Skill: - JITSI / Video conferencing / Android / BlockChain / XMPP / Erlang / Ejabberd / MongooseIM - Highly skilled on Drupal-based website with CiviCRM integration - WebRTC based secure call integration - Proficient in Laravel based web application - Specialized in Node JS based web applications - Resourced on Agular JS-based front end - Experienced in Objective-c/Swift for iOS app - Java, Python, Javascript/JQuery - Wireframe design - Graphic design - Bug fixing, optimize the app - Admin Panel & APIs Development - I have Ejabberd and MongooseIM core modules modified to make it more stable for Android clients (using Smack) and iOS clients (using XMPP Framework) Program Languages: - Ejabberd (Erlang) - Chat server - Node.js - API and web backend - Angularjs - Web front end - Android - (Kotlin/Java) - iOS ( Swift and Objective C) - Sip - XMPP My methodologies:- - I possess excellent communication skills and will be in regular contact for updates. - I can work as a part of a team or individually also, multi-tasking, prioritizing the task, and work towards deadlines. - I can provide service 24/7 - I assure you that I'll do my best efforts for the project assigned to me. - I provide the next step to be taken for the apps which looks complete. - I have the potential to deliver a solution from beginning to end. Looking forward to building a long-term partner relationship. Thanks!
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    Session Initiation Protocol
    Erlang
    XMPP
    WebRTC
    Objective-C
    Swift
    Android
    iOS Development
  • $40 hourly
    I am a VoIP professional with over 12 years of experience. I am an expert in Asterisk, Freeswitch, SIP Trunking and provide consultations on these to my clients. Throughout my experience I have designed and developed a number of VoIP, Telecom Solutions like IVR Systems, Autodialers, Conferencing Solutions and Voice Mail solutions from scratch. I develop solutions over multiple programming languages like Javascript (NodeJS), PHP, Java using Asterisk (ARI, AMI and AGI) and Freeswitch (ESL). I also provide support for installation, configuration and maintenance of Asterisk, Freeswitch and other VoIP Switches.
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    WebRTC
    FreeSWITCH
    Session Initiation Protocol
    Kamailio
    VoIP Software
    Asterisk
    Linux System Administration
    JavaScript
    Node.js
    VoIP Administration
    Twilio API
    PHP
    Web Service
  • $60 hourly
    Support and development on asterisk, vicidial, goautodial, fusionpbx, freeswitch Linux System Administration ( CentOS, Debian, Ubunut) Database Management (Mysql, PostgreSQL) Network Administration (Router, Switch, Hardware Firewall)
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    VoIP
    Linux System Administration
    VICIDIAL
    PHP
    MySQL
    FreePBX
    Network Administration
    Android
    A2Billing
    iOS
    FreeSWITCH
    Asterisk
    Customer Relationship Management
    Mobile App
    Session Initiation Protocol
  • $130 hourly
    With over two decades of extensive experience in the world of programming, I've honed a knack for efficiency and innovation. I believe in optimizing time and delivering solutions that matter, constantly pushing the boundaries of what’s possible. From the age of 10, programming hasn't just been a job—it's been a calling. Whether you're looking for new project development or leveraging existing solutions, I’m your go-to expert. Experience: Twenty-two years of diverse commercial programming experience and 31+ years overall programming —from Linux administration and virtualization to end-user web development and complex billing systems for VoIP. Expert work with Asterisk since its inception and substantial experience with FreePBX, Trixbox, and a2billing. Proudly, I'm one of the contributing minds behind a2billing.org's trunk. My depth of expertise encompasses database administration and architecture, especially with MySQL and Postgres. Education: Master of Science in Computer Science (confirmed by WES) Technical Skills & Specializations: Languages: Python/Django, Javascript/jQuery, SQL, PHP, C/C++, Perl, Prolog/Lisp, and Forth. Platforms & Tools: Asterisk, Opensips, Kamailio, Callweaver (faxing). Noteworthy Contributions: Developed modules for FreePBX, Elastix, Trixbox, and a2billing. Philosophy: I stand for originality and meaningful impact. If a task doesn’t need to be done, I won’t push for it. Instead, I'll direct my energy towards novel and intriguing challenges, ensuring that you get the best of both worlds—innovation and efficiency.
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    Session Initiation Protocol
    C++
    PHP
    Kamailio
    Asterisk
    MySQL
    Amazon EC2
    Linux System Administration
    SQL
    Elastix
    A2Billing
    VoIP Administration
    OpenSIPS
    FreePBX
    Virtualization
    Python
  • $30 hourly
    Greetings to All, I am working as Senior System Administrator and VoIP Engineer for the last 7 years.I am an expert in setting up Class 4-5 Grade voip Softswitch (e,g PortaOne,voipsoft-switch) and also an expert in setting hosted PBX both multi-tenant and stand-alone. My Core skill is to Administer different types of VoIP system based on asterisk ( e.g.Freepbx,Asterisknow,Issabel,Elastix),Freeswitch(e.g.Fusion-PBX),Grandstream UCM and Linux(Centos-7, Ubuntu).I am also a certified expert in Vmware data center virtualization on Vsphere 6.7 . and Red Hat Certified Engineer. In this recent years i have completed so many systems and virtualization-related projects such as I have deployed 2000+ user mail server using zimbra and postfix then implementing data center virtualization and VoIP Platform using Elastix and freepbx on various Financial organizations such as Bank, IT,etc. I have completed my Bachelor in Electronics and Telecommunication also did my Masters in Computer Science.Hence My skills are sufficient to solve any complex and long-term work smoothly and accurately. Building state-of-the-art, easy to use, user-friendly websites and System applications is truly a passion of mine. I actively seek out new technologies, and stay up-to-date on industry trends and advancements. Thanks
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    VoIP Software
    Elastix
    VoIP PBX
    3CX
    VoIP Administration
    Virtualization
    Network Engineering
    Asterisk
    FreePBX
    VMware Administration
    Zimbra Administration
    VICIDIAL
    Linux System Administration
    Microsoft Azure
    CentOS
  • $35 hourly
    1) Free PBX Expert (Installation, Development, Configuration, Technical Support). 2) Fusion PBX Expert (Installation, Development, Configuration, Technical Support) 3) Asterisk Expert (Installation, Development, Configuration, Technical Support). 4) Vicidial Expert (Installation, Development, Configuration, Technical Support). 5) Go Auto Dial Expert (Installation, Development, Configuration, Technical Support). 6) Fop2 Expert (Installation, Development, Configuration, Technical Support). 7) VOIP Expert. 8) IVRS (Design, Development, Configuration, Technical Support). 9) Linux, Mysql Database Expert. 10) Lua Expert. 11) PHP, Mysql, Perl expertise. 12) Rabbit MQ, Redis, Ha proxy Expertise. 13) Freeswitch (Development, Support, Installation) 14) AI / Voice Bot Expert using unimrcp. Projects Handel: 1) IPPBX. 2) Contact Center Solution. 3) SoftSwitch. 4) Autodialer/ Voice Broad Casting System/ Call Back System/Calling Card System. 5) IVRS/Voice Mail /Conference Solution. 6) Voice & SMS Broadcasting System. 7) VOIP Billing Solution. 8) PRI / ISDN/ GSM gateway Integration expert. 10) Solution Design Expert. 11) Architecture Expert. 12) Cloud / On-premises PBX/ contact center / Soft switch Deployment expert.
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    Linux System Administration
    MySQL
    VICIDIAL
    PHP
    OpenSIPS
    Session Initiation Protocol
    FreePBX
    VoIP Administration
    FreeSWITCH
    Asterisk
  • $75 hourly
    I have been in the IT field for 12+ years. I have engineered, implemented and managed phones systems for most of the 10 years. I have dealt with most phone systems in my 10 year career. I also have a background in Networking. I am proficient in setting up LAN networks and basic routing. I also have dealt with a CLEC switch for part of my career. Vendors I worked with directly: Metaswitch Digium Adtran Edgewater Networks dba Ribbon Every major carrier in my area(ATT, Windstream, Frontier, Century Link) Fonality dba Netfortis Polycom Yealink Snom Interactive Intelligence dba Genesys GSuite Google Workspace Fusion PBX/FreePBX/FreeSwitch AWS Azure Cisco Networking Equipment Watchguard Sonicwall 3cx Hubspot SIP trunking with multiple VOIP providers
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    Network Engineering
    Phone Communication
    Web Hosting
    VoIP
    FreePBX
    3CX
    Squarespace
    Telecommunications Engineering
    VoIP Administration
    Cisco IOS
    Asterisk
    Session Initiation Protocol
    Cisco Router
    Linux
  • $25 hourly
    Hello, Thanks for visiting my profile. This is Abid Ur Rehman, Certified Asterisk dCAP, 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 10 years of VoIP/Linux/IT/Network planning, design, development, deployment, optimization, administration, and support experience in top-notch organizations such as Telappliant Ltd., Techloyce, Dialer360, and Primo Dialer. Skills and Certification: IP PBX: 3CX, Asterisk, FreePBX, Elastix, PBXware MT, FreeSWITCH, FusionPBX, Issabel, VoIPOffice Bitrix24 integration with FreePBX with or without the InforUnity module and with 3CX Pro/Enterprise. SMS Blast/Broadcast using SignalWire, VoIP.ms, Telnyx, Anveo, Bandwidth.com, Plivo, Skyetel, Twilio, VoxTelesys, BulkSolutions, Flowroute, Intelepeer, and BulkVS Telecom Billing: A2Billing, ASTPP, Yeti, 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 (and FreePBX phone system), Elastix IP PBX, Grandstream UCM, Yeaster S-series, Renegadepbx-1U-Appliance-with-FreePBX, Patton's SmartNode Branch eXchange (SNBX), SwitchVox, OpenVox. 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, SignalWire, etc. For bulk SMS, I can setup a code with the front-end for sending bulk SMS from a CSV file. UK: Fuse 2, BT, VoIPTalk, DrayTEL, Telappliant, Gamma, sipgate, VoIPFone, VoiceFlex, Voicehost, Brightstar, Yellowgrid, Gradwell, T4com Ltd, Voxbeam, and Spitfire Linux Distro: 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 Hypervisor: VMware ESXi, station and player, VirtualBox, ProxMox, oVirt, HyperV, I would be very happy to assist start-ups as well as SMEs in achieving their goals and business objectives. Thank you!!
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    Twilio
    VoIP Administration
    PBX
    Full-Stack Development
    VoIP PBX
    MySQL
    A2Billing
    3CX
    Kamailio
    Asterisk
    FreeSWITCH
    Linux System Administration
    FreePBX
    VICIDIAL
    VoIP
  • $35 hourly
    Bertrand Ndakena has a M.A. in Telecoms. He is a Udacity certified cloud developer and self-taught cloud administrator. Passionate about cloud developments/operations. Also interested in AI/ML and Data Science. Has extensive experience setting up cloud solutions(both open source and proprietary) and VOIP(including SIP-based) solutions.
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    Session Initiation Protocol
    A2Billing
    VICIDIAL
    WebRTC
    Service Cloud Administration
    VoIP Software
    Asterisk
    FreePBX
    VoIP Administration
    FreeSWITCH
    3CX
    Elastix
  • $40 hourly
    Highly experienced IT specialist with 4 years of dedicated work in the troubleshooting of SIP and VoIP devices. I specialize in Grandstream systems, boasting a deep understanding of their operation, troubleshooting, and efficient resolution of issues. My expertise extends to a range of other VoIP SIP brands such as Fanvil, ensuring versatility in handling various equipment and technologies. Over the years, I've developed a strong analytical and problem-solving skill set, which has allowed me to identify and address issues quickly, minimizing downtime and ensuring smooth system operation for clients. I'm committed to staying up-to-date with the latest trends and developments in the field of VoIP SIP technology to provide the most relevant and effective solutions. If you're looking for a diligent, tech-savvy, and reliable professional to maintain and optimize your communication systems, I'm at your service. Your communication needs are my priority, and I pride myself on providing responsive, quality service tailored to each client's unique requirements. Skills: Proficient in multiple protocols: SIP, VoIP [voip or VOIP], SSL, HTTP, HTTPS, SSH, TCP, UDP, RTP. Knowledge of various standards such as RFC 2543. Skilled in troubleshooting tools like Wireshark and Audacity. Remote support capabilities, with availability during night hours. Comprehensive understanding of all series that Grandstream offers. Fluent in English, with the ability to conduct meetings via Google Meet, Microsoft Teams, Anydesk, etc. Technical Support Specialist, Grandstream Networks (Feb 2019 – Apr 2023) During my time at Grandstream Networks, I was responsible for troubleshooting a wide range of SIP and VoIP devices. I specialized in delivering efficient and effective solutions to various technical issues, ensuring customer satisfaction, and maintaining smooth operations. My responsibilities included: Troubleshooting and resolving issues with various Grandstream series. Providing remote support during off-hours to ensure uninterrupted service. Utilizing tools like Wireshark and Audacity for advanced troubleshooting. Communicating effectively with clients in English over platforms such as Google Meet, Microsoft Teams, and Anydesk. Thank you for your cooperation.
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    Twilio
    Telecommunications Engineering
    Virtual Assistance
    Data Entry
    SQL
    Python
    OpenCV
    Computing & Networking
    RingCentral Glip
    Asterisk
    FreePBX
    VoIP
    Technical Support
    Session Initiation Protocol
    Grandstream
  • $50 hourly
    I'm a senior C, C++ developer with a passion for working on complex high-performance, and low­ latency systems for telecommunications like own Media Server to Media and Signaling servers like Freeswitch, Kamailio, OpenSIPS, JANUS, Kuranto, and JITSI. Furthermore, I started working on AI in the last six years and worked on ChatBots and VoiceBots. - Have a perfect experience on NLP/NLU open source and cloud platforms like Google dialog flow and Microsoft Luis. - Create custom Modules of Freesiwtch and JANUS for Google, Amazon, IBM Speech To Text, and Text to Speech for real-time transcribers. - Create Conversational IVR and Voice Translator with the help of Google And Amazon. - Real-Time text-to-speech and speech-to-text with NLP/NLU. - Real-Time translator using Google. - good experience in Server Side audio processing and sending audio to any channel. - Excellent experience on Kaldi, Rasa(NLP, NLU), and Python Wavenet library to train models. ✅ Technical Skills : - Development: C/C++, Python - Opensource: TensorFlow, Rasa, WebRTC, reSIProcate - Technology: SIP, Audio/Video, NLP, NLU, Kaldi, deep speech(Mozilla). - Tools (Master): Wireshark, SIPp - Having enough experience with VoIP library for iOS, Android & Windows in C, and C++. - Having experience in VoIP clients and server development. ✅ Develop for all the platforms you need. We cover: - Web - iOS and Android phones and tablets Develop web apps that work on mobile browsers, e.g., video chats, audio and video calling, and audio-video SDK. We help to plan your product and develop it so that users love it. Work with companies and startups to create new products and improve existing ones. ✅ Have the right processes you know in advance. Ours: 1 - Sales managers are 1st level, software analysts. They clarify your needs. You get 3 results: what users can do - user stories, recommended technologies, and estimate based on previous projects. 2 - Analysts clarify details and draw wireframes. They are mockups of all the pages with clickable buttons. So you can play with your app before it’s developed and make changes for cheap. Based on wireframes, we calculate project time and price estimation. 3 - Designers draw clickable graphic design prototypes. 4 - A team of developers, test engineers, and a project manager develops the product. 5 - The team installs it on your server and helps with app store submission. We do maintenance - part-time work on minor improvements after launch. Write to discuss and estimate your project. We give user stories and recommend technologies for free after a call. Without a call, we can’t do it well, unfortunately. All the right questions in writing would have taken days and still much missed. Answer the same workday. On weekends we rest, but if you have a chance - respond too. So please write to us now :)
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    React Native
    Session Initiation Protocol
    LLM Prompt Engineering
    LLM Prompt
    Bot Development
    VoIP
    WebRTC
    Kamailio
    OpenSIPS
    FreeSWITCH
    Video Stream
    Swift
    Dialogflow
    Artificial Intelligence
    Node.js
    Kotlin
    C++
  • $75 hourly
    - Over 10 years of Call Center management experience - Owned and operated Call Center in Lima Peru 7 years - Owned and operated Call Center in Philippines 3 years - Experience building Call Centers from the ground up - Linux, Vicidial and GoAutoDial (installation, configuration and management) - Ability to effectively hire, train, and manage staff (personally supervised over 500 staff and agents) - Payroll management, scheduling, reports, and technical expertise - Extensive work with cost reductions and client relations In addition to my extensive Call Center experience, I have excellent communication skills. I always maintain a gracious and professional manner when communicating with people, including clients and staff. My broad experience and range of skills make me a superior candidate
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    BPO Call Center
    VICIDIAL
    Call Center Management
    Project Management
  • $20 hourly
    Have been experienced for the last 16+ years, I have been developing mobile apps, both on iOS and Android platforms on native with platforms like Kotlin and Swift. I did work with a lot of clients ranging from Fortune 500 companies to budding startups and have successfully provided top-quality apps. I am a highly motivated professional and work with a result-driven approach to provide the best solutions before/on time. Several of my apps are available on the app stores and have an ever-growing customer base. I have expertise in the following skills – 1) Swift 2) SwiftUI 3) Objective C 4) Kotlin 5) Flutter 6) React JS 7) Node JS 8) Angular I have also been experienced in OTT development such as Android TV, Apple TV, Amazon Fire TV, ROKU, Tizen, XBOX, and many more. API Integration – a. Custom REST-based web API or web service integration. b. Social – Facebook, Twitter, LinkedIn, Google+ c. Push Notification – Apple Push Notification service (APNs), Google Cloud Messaging (GCM) d. Payment – Apple Pay, Android Pay (Google Wallet), Paypal e. Location – Google Maps, Google Play Location API, Core Location Framework (Apple), MapKit (Apple) f. Advertisements – iAd (Apple), AdMob (Android) Other Skills - SVN, github, bitbucket, MS Word, MS Excel I have been associated with TychoTechnologies and We are a leading product development company with expertise in building digital solutions that garner change and transform experiences. * Qualification Highlights: - 14+ Years of experience in Front-End & Backend Development - 17+ Years of experience in Web and Mobile Apps Development - Developed and Managing India's TOP OTT platforms and Travel Booking sites - Working for the God Of Cricket Sir Sachin Tendulkar on his app 100MB We give - Effective Communication. - Commitment to Quality. - 24/7 Customer Support. - Cost Efficiency (Maximum ROI) - Protection of Intellectual Property. We provide services in fields of: 1. Web Designing & Development 2. HTML5, CSS3, XML, Bootstrap 3. Core PHP Development 4. Code Igniter, Cake PHP, Laravel Development 5. Wordpress, Python, Magento Development 6. Node JS, Angular JS, Express JS, 7. Dot NET MVC 8. AWS, Azure and Google Cloud Solutions Provider 9. Hybrid and Native Mobile App Development 10. Android & IOS App Development 11 IOT 12. Machine Learning 13. Blockchain Development 14. React and React Native 15. Mongo DB, Cassandra, BigData 16. Crypto Currencies Exchange 17. Penetration & VulnerabilityTesting There are many more technologies in which we work.
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    AR & VR Development
    AR & VR
    Mobile Development Framework
    Over-the-Top Media
    Web Application
    Roku
    Progressive Web App
    Socket.io
    Chat & Messaging Software
    Android App Development
    iOS Development
    Android
    Kotlin
    React Native
    Swift
  • $25 hourly
    Hi Guest, First of all, thanks for visiting our profile. I am doing freelancing since 2010 and my expertise on complete VoIP solution including Freeswitch, Asterisk, PJSip, Opensips and Kamailio. I just recently launched a company which is not offering only VoIP solution but Zeus in Web Development(PHP, WordPress etc), Mobile App Development(Android & iOS). We are a team of members having extensive knowledge of all the services we are offering. We have successfully completed many projects delivered competent results with 100% accuracy with lifetime free support. To keep in mind 100% availability, Our dedicated manager is always online to make sure our client will face no more difficult to ask any query at any time. Let me mentioned the technologies which are our core strength listed below: Core PHP (All Frameworks) CMS(Wordpress, Joomla, Magento) VoIP(Opensource Billing software, Asterisk, Freeswitch, Kamailio, Opensips) Mobile App Development(Android, iOS specially Mobile Sip Dialer) Graphics Design Digital Marketing(SEO, SMM, SMO and PPC) Our price is very reasonable which allows us to work with us. Please share your requirement today only with us to check our capabilities to take your experience on the next level. To name a few tools & technologies that I have worked on: • High-level languages: C++, Objective C, Java, Python, PHP • IDEs: Xcode, Android Studio, Eclipse • Version Control & CI: SVN, Git, Perforce, Bitbucket, Jenkins • DBMS: MS SQL, MySQL, Oracle, PostgreSQL, MongoDB • Frameworks: Django, Zend, Magento, Django REST • Management tools: VersionOne, Jira, Trac, MS Project, MS Visio, XMind, Bugzilla, Balsamiq • Amazon Web Services (AWS) - EC2, S3, SQS, SNS, RDS, CloudTrail, Cloudfront
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    WebRTC
    iOS
    Android App Development
    AWS OpsWorks
    VoIP Software
    iOS Development
    FreePBX
    AMP Framework
    VoIP
    Session Initiation Protocol
    Asterisk
    VoIP Administration
    FreeSWITCH
    WordPress
    PHP
  • $60 hourly
    Asterisk/FreePBX/Elastix, IVR, CRM, TTS, ASR, Virtual PBX, VAS, Voice Broadcast, SMS, VoIP, Contact & Call Center, Asterisk, Consulting, Development, click2call, callback, CRM: bitrix24, amocrm and etc
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    A2Billing
    Asterisk
    API Development
    MySQL
    FreePBX
    VoiceXML
    VoIP Software
    SMS
    PHP
    Scripting
  • $35 hourly
    Have experienced more than 5 year on 3CX install, configure and troubleshot. Linux and windows operating system. On premises and Cloud implementation using SBC for IP Phone and FXO Gateway. Call center implementation experience for optimizing outgoing calls using predictive dialer and other call flow design
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    Session Initiation Protocol
    3CX
    VoIP Software
    VoIP Administration
    Linux System Administration
    Office 365
    Google Cloud Platform
  • $25 hourly
    I am 34 from the UK and have been working in VoIP for nearly 10 years i have experience in working with Asterisk based systems, i am Basic, Intermediate and Advanced Certified Engineer with 3CX PBX and have also have experience with Netsapiens and broadsoft. I have received certifications for Yeastar and also Certified for Grandstream UCM and Networking products and also have very good knowledge of yealink, Fanvil and snom products. I can set up from scratch or provide maintenance on your VoIP system which can include training and guides on how you can manage and troubleshoot yourself after the work. Contact me if you need help setting up, cleaning up or maintaining your system.
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    Technical Support
    System Configuration
    3CX
    Computer Network
    Linux System Administration
    Asterisk
    PfSense
    VoIP Administration
    Session Initiation Protocol
    Grandstream
    VoIP Software
    FreePBX
    VoIP
    Ubiquiti
  • $85 hourly
    Hi, my name is Anis BEDHIAFI. I am a Senior VoIP Engineer. I am SSCA® certified My expertise covers most parts of VoIP networks including SIP devices and endpoints to IPBX systems, Call Centers, SBCs and more. I work on Cisco, Broadsoft and Oracle products. - Cisco/BraodSoft - Acme Packet/ Oracle Enterprise Session Border Controller - Oracle Session Delivery Manager SDM In the open source world, I work on: - Kamailio - OpenSIPS - Freeswitch - FusionPBX - ASTPP - Homer - Linux (Debian, Ubuntu & CentOS) - Webrtc My Skills: VoIP, SIP, FreeSWITCH, FusionPBX, ASTPP, Kamailio, Asterisk, FreePBX, PyFreeBilling, Elastix, WebRTC, SIP trunking, fail2ban, IPBX, Debian, Ubuntu, CentOS, Amazon AWS EC2, Windows Azure, Python, PHP, Lua, MySQL, PostgreSQL
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    VoIP PBX
    Linux
    PBX
    Debian
    VoIP Administration
    API
    Asterisk
    FreeSWITCH
    Session Initiation Protocol
    OpenSIPS
    Amazon EC2
    VoIP Software
    Kamailio
    Laravel
    WebRTC
  • $55 hourly
    I have 18+ years expereince in VoIP/SMS setups using IVRs, asterisk , Freeswitch, MS Teams and Opensips/Kamailio and VoIP | Freeswitch | Opensips | Contact Centers| Conversational AI| Amazon Connect|MS Teams
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    Session Initiation Protocol
    CentOS
    Linux
    FreeSWITCH
    Customer Relationship Management
    A2Billing
    Asterisk
    MySQL
    WebRTC
    Android
  • $150 hourly
    Feedback: 💭 "Roman has a vast knowledge of what he is doing and really good at what should be done" 💭 "He has good social skills; is patient and a good communicator. His skills are very much in demand" 💭 "If some solution does not work or is not possible Roman will find another way to get the task done" 💭 "His research is solid, resulting in a good overview of possibilities to (re-)direct the project" Expertise: Streaming & Multimedia: 📺 Media applications (ffmpeg, gstreamer, opencv) 🎛 Media services (kurento, mediasoup, janus, wowza) 📹 Streaming protocols (webrtc, hls, dash, rtmp, rtsp) 🧩 Codecs and Muxers (h.264/avc, h.265/hevc, av1, vp9) 📐️ GPU programming (opengl, opencl, cuda, vulkan, hip) 📠 IP Telephony (asterisk, freeswitch, sip, voip) DevOps & Cloud & IoT: ☁️ Cloud Infrastructure (aws, ansible, terraform, kubernetes) ⛓ Build and test automation (jenkins, gitlab, ci/cd pipelines) 🔗 Tunneling protocols (openvpn, wireguard, gre, ipsec) 🧶 Bulk networking (dpdk, bpf/ebpf, xdp) 📦 Virtualization (kvm, qemu, crosvm, virtio) 🔋️ IoT / Embedded (raspberry pi, jetson, nordic, ble) 💻️ Linux deployment (containers, docker, yocto) Software development: 🐍️ Python (flask, asyncio, fastapi, websockets) 🍀️ C/C++ (qt, cmake, meson, kernel, ndk, maths) ⚙ Rust (cargo, actix, tokio, rayon, solana) 🛠 Reverse engineering (disassembling, protocols)
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    WebRTC
    Kernel
    FFmpeg
    Docker
    CUDA
    Video Processing
    Internet of Things
    GStreamer
    Rust
    Amazon Web Services
    DevOps
    Python
    C++
    Embedded Linux
    C
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