OpenSIPS Freelancers

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OpenSIPS Job Cost Overview

Typical total cost of Upwork OpenSIPS projects based on completed and fixed-price jobs.

Upwork OpenSIPS Jobs Completed Quarterly

On average, 3 OpenSIPS projects are completed every quarter on Upwork.


Time to Complete Upwork OpenSIPS Jobs

Time needed to complete a OpenSIPS project on Upwork.

Average OpenSIPS Freelancer Feedback Score

OpenSIPS Upwork freelancers typically receive a client rating of 4.94.

Last updated: July 1, 2015

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  1. Lorenzo Muscariello

    Lorenzo Muscariello

    Senior Software Engineer

    Italy - Last active: 01/23/2014 - Tests: 3

    I currently work on Linux based Home Automation and ToIP Appliances. My experience ranges from JAVA/PHP/C applications design and development to Networking and Telecommunication systems design/development and operations management. I've spent about 5 years of my working time designing and implementing Asterisk and OpenSIPS based ToIP solutions for a wide spectrum of scenarios from SOHO to VoIP Carriers ( and Call Centers of different scales. I've also written a lot of customized AGI applications (JAVA, PHP, BASH, PERL) to deliver specific services or to integrate with customers' CRMs or other kinds of Enterprise Systems.

    $38.89 /hr
    0 hours
  2. Marcin M.

    Marcin M.

    VoIP developer

    Poland - Last active: 1 day ago

    9+ years of professional experience in VoIP and telecommunication includes in-depth knowledge of Asterisk PBX, Freeswitch, Kamailio/OpenSIPS. Main skills is design and deploy multitennant load balanced VoIP systems with failover include realtime prepaid billing system. Other already done projects such like: - Conference servers (Asterisk,Freeswitch) - web based billing system - postpaid,prepaid (A2billing - Asterisk) - realtime prepaid systems (Freeswitch + Cgrates) - web based voice broadcast system (autodialer) - SS7 gateways (Asterisk,chan_ss7) - web based fax broadcast system (t.38, HylaFax) - web based sms broadcast system (Kannel) - Fax2Email system - Skype gateway (Asterisk) - SMS gateway (2N Stargate) - web based campaign system with agents interact (call/contact center) - FreePBX / Elastix configuration

    $30.00 /hr
    258 hours
  3. Rahul Pathak

    Rahul Pathak Agency Contractor

    C, C++, WebRTC Mobile, VoIP developer.

    India - Last active: 1 month ago - Tests: 1 - Portfolio: 8

    I have around 5 years of experience in VoIP domain. I am working on WebRTC stack from last 1.5 years. I am working on VoIP library for IOS, Android and Windows on C,C++. I had experience in developing VoIP clients and servers. I made 4 of VoIP clients and 1 B2BUA server. 2 are on IOS. And 1 on the Web using SIP and WebRTC. 1 on Phonegap for Android and IOS. I had lots of experience SIP, RTP, RTCP, SRTP, HTTP, WS, NAT, LTE, XMPP. And C, C++, Objective C, JNI, JAVA and more.. I have very much of experience in Asterisk and freeswitch PBX. I have also experienced in the B2BUA proxy server.

    Associated with: rbapptech

    $33.33 /hr
    0 hours


    Linux / Unix / VoIP / VmWare Architect/Consultant/Administrator -

    Pakistan - Last active: 11/06/2013 - Tests: 3

    I have 8 years technical experience and interests as a VMware Consultant, VoIP, Network Manager, system engineer and system architect focuses on Linux/Unix{AIX,Solaris}/Windows/Cisco/VoIP ,Open Source software & Business Development to take an organization to next step Skills include deploying, migrating and managing large-scale Unix/Linux/Windows server and desktop environments, packaging Linux/Unix/Windows software, designing and implementing system tools and automating operational tasks using php, shell scripting and perl I am available for work inside or outside of my home country

    $16.67 /hr
    0 hours
  5. Shan Jay

    Shan Jay

    Telecom professional with 8+ years of experience

    India - Last active: 5 months ago - Tests: 1

    -- A dynamic professional with 8+ years of experience in Business Analysis, Solution Architecting, Pre Sales, Technical Sales, Project Management, Delivery Management in Telecom verticals like VoIP, MVNO, GSM, VPN, Telecom Billing, OSS/BSS , Mobile Money, MNP. - Excellent knowledge in Architecting different MVNO Models,telecom Billing, Baseline set-up, E2E VoIP Integration and Enterprise Reporting related issues. Technical Knowledge : - GSM - HLR, STP, GMSC, MSC, SS7, USSD, IVR, SMSC, GGSN, Load Balancing, prepaid and postpaid billing systems Cloud Based Architecture for MVNO, MNO. - MVNE – Implemented different Models of MVNE Architectures all over the world. - Telecom Billing – Siebel CRM, BRM, AIA, Andes, eTOM. - OSS/BSS Stacks. - VoIP – SIP protocols, Asterisks, Mobile Dialers, Transcoding , Codec’s handling, VoIP System Architect. - C++ Programming skills.

    $44.44 /hr
    0 hours
  6. Tushar Jain

    Tushar Jain

    Voice & Data Consultant

    Australia - Last active: 06/07/2014 - Tests: 3

    Tushar is a seasoned professional with 11+ years of experience in managing network operations in a service provider / NOC environment. Experienced & Skilled in Telecoms, MPLS, BGP, VoIP, SIP, Network Support and Managed Services, Remote Network Monitoring, Networking Services, Carrier Services , Telephony Services, IT Managed Network Services, Remote NOC Support. With an In depth design, implementation and support experience in Integrated network management system, Prepaid billing system, Switching, VOIP & Telephony services, SIP Trunking and many more areas, he brings with him a wide experience and has proven to be of great value to all the organizations and clients he has worked for.

    $22.22 /hr
    0 hours
  7. Tinikonia T.

    Tinikonia T.

    Teinikonia Technology Services

    India - Last active: 08/27/2013 - Portfolio: 1

    Tinikonia Technolgy Services began operations to offer cost effective solutions and more productive solutions that deliver solid bottom line results to each of our clients/customers. Our team delivers with the utmost in integrity and professionalism. We service clients nationwide and our commitment to excellence remains the same, providing highly effective services to take care of your requirements.

    $22.22 /hr
    0 hours
  8. Ziadi M.

    Ziadi M.

    Expert Linux System Engineer

    France - Last active: 09/19/2014 - Tests: 1

    I am a hands-on, highly competent Linux system engineer with 4 years’ experience and a strong performance background in wide variety of professional system support and solution-based IT services for Linux Systems (or dministrations) including, monitoring, configuration, troubleshooting and maintenance of operating systems. I have worked on numerous projects from concept to completion. A specialist in VOIP and LAMP platforms, I take pride in administrating Linux systems and regularly refresh my skills to ensure I keep up with ongoing developments.

    $16.00 /hr
    0 hours
  9. Muhammad Shirjeel Jamal

    Muhammad Shirjeel Jamal

    .Net, PHP, VOIP, Smart Phone Developer

    Pakistan - Last active: 11/15/2014 - Tests: 1 - Portfolio: 3

    Tech Bridge Consultancy is a leading provider of technology services and solutions with a global presence in North America, Europe and Asia. We believe that innovation, quality, integrity and effective client partnership are the key to success. Since our inception in 2005, we have built a strong reputation as a technology leader, by partnering with our clients to engineer high quality solutions which out-perform expectations. Through a balanced combination of a wide range of services, cutting edge information solutions, dedicated professionals and a collaborative client-value approach; we help businesses realize success. Drawing upon 10 years of cumulative extensive project management experience, we translate strategies into creative, robust, and effective systems that leverage our clients’ unique competitive advantage. Our mission is to build long term, mutually profitable relationships with our clients, by providing products and services which meet and in most cases, surpass expectations.

    $25.00 /hr
    0 hours