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.

3

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.

4.94
Last updated: May 1, 2015

Popular OpenSIPS Searches

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  1. Dmitry Sytchev

    Dmitry Sytchev

    Asterisk/Freeswitch/Kamalio expert, VoIP engineer, Linux administrator

    Russia - Last active: 14 days ago - Tests: 7 - Portfolio: 1

    I have more than 10 years of experience in installation and support of carrier-grade VoIP services based on Asterisk, OpenSIPS, Kamailio, Freeswitch and proprietary SIP/VoIP software. My professional interests are Callcenters, automated dialer systems and integration of VoIP software with company information flows. You can rely on my strong engineering and programming skills for projects starting from single VoIP server to a complete wholesale/carrier VoIP solutions including billing, call data analysis, security and fraud prevention. I have developed complete SIP solutions for VoIP carriers worldwide: Proxy/Registrars, IVR, prepaid systems, multi-tenant VoIP switches, hardware PSTN gateways (Cisco AS5300/5500, Audiocodes Mediant 2000, Quintum Tenor). I have experience in setup, administration and security of Asterisk, FreePBX, Elastix and FreeSWITCH PBX installations. As a programmer I use PHP, Javascript (both client-side using jQuery and Angular.js and server-side with node.js), Perl (system scripts/applications, Mojolicious webapps). I also have experience in development and administration of MySQL and Microsoft SQL Server databases. I'm experienced network engineer, skilled in routing and switching, general network architecture planning and deployment, network monitoring and security, including HA solutions (heartbeat/pacemaker). I use Zabbix and have some experience with Nagios and other monitoring software. I can also offer you consulting support in VoIP and network technologies.

    $33.33 /hr
    88 hours
    4.96
  2. Igor Gamayunov

    Igor Gamayunov

    Software Architect and Developer

    Canada - Last active: 3 days ago - Tests: 1

    I have been developing Asterisk based telephony systems for more then 8 years and have very extensive, more than 18 years, Linux development experience. I have provided Asterisk and OpenSIPS cloud based solutions that comprise both back and front-end components and include complex dial-plans, IVRs and AGI scripts, in the following areas: - Hosted PBX applications - Conference bridge applications - Call Center applications - Intelligent Telephony load and stress test applications - Asterisk ARI - Asterisk WebRTC - REST API, OAuth 2.0 I have designed and developed Asterisk based Call Center system that is running on the AWS EC2 instances. This system is successfully integrated with the following platforms: - Proprietary CRMs - vTiger - Bigcommerce - Shopify - Nation Builder - NGP VAN I have very extensive customer support experience and good at writing user guides and developer API documentations. In addition I have a Project Management certificate.

    $38.89 /hr
    588 hours
    5.00
  3. Gohar A.

    Gohar A.

    VoIP Consultant [Asterisk, freeSWITCH, Kamailio, OpenSIPs, Vyatta]

    Canada - Last active: 2 months ago - Tests: 3 - Portfolio: 14

    Since last 7 years now I'm involved intensely in end-to-end VoIP setups. That included pre-deployment 360 degree Architecture planning. Actual development of the projects, including aiding other teams develop the exact required component for the projects. And after deployment Support. My career objectives are to be a very flexible expert capable of working on almost any layer. Come up with intelligent solutions to help achieve business goals smartly. I'm proficient in following domains * VoIP * Server Administration * Network Administration I've experience in Following tools. * Asterisk * FreeSwitch * OpenSIPs * Kamailio * SEMS * Vyatta * MySQL * Linux OSs I've worked in following languages. * C++ * Perl * Php * Shell scripting Find More about Me from my VoIP Blog: http://saevolgo.blogspot.com

    $60.00 /hr
    152 hours
    4.99
  4. Arsen S.

    Arsen S.

    VoIP Administration & Development

    Bulgaria - Last active: 1 day ago - Tests: 2 - Portfolio: 6

    I am focused in VoIP field only and I have been working here for more than 8 years. My Area of experiences: VoIP -Asterisk PBX: Full proficiency -FreeSWITCH: Full proficiency -Yate: Full proficiency -Strong knowlege of SIP protocol and SIP routers/proxy servers -OpenSER (Kamailio/OpenSips) -Load Balancing, Least Cost Routing, High Availability, NAT Traversal, Rate and billing systems, etc. -IVR and Auto Attendant Development -Secure VoIP: TLS, SRTP, ZRTP Full proficiency in free Billing/CDR solutions: -A2Billing: Full proficiency (configuration from scratch, customisation) -CDRTool (prepaid billing/accounting and sip tracing for OpenSIPS using RADIUS) -CDR-Stats (call detailed statistic/realtime stat for asterisk and freeswitch) -cgRates (billing for Freeswitch) I provide: - Development of custom Billing and software solutions for Premium Rate Numbers business. - HA and Scalability solutions for existing VoIP networks. - Development and optimisation of VoIP networks/projects. - Ongoing support via request/ticket tracker system. - VoIP Security and Hacker protection solutions. I have successfully completed large amount of commercial installations of VoIP PBX servers. From SOHO to Enterprise deployment including integration of various VoIP solutions into existing network environment. I also have experience in building of secure "bastion" VoIP/Linux servers. Payment Terms: Minimal support package 5 hours. Short-term hourly support: $50 For long-term support please contact for price options. For sizable development projects please contact for price options. We charge upfront scoping (roadmapping meeting, flat-rate). Hourly based projects: -Current hourly rate is $50. Price per projects/feature: -Fixed price projects are calculated based on the hourly rate and expected task complexity. -For all fixed price projects complete project specification with clear tasks description is required -For all fix price projects work will be started only after payment has been es-crowed and both parties have agreed with working terms.

    $55.56 /hr
    126 hours
    5.00
  5. Ambika P.

    Ambika P.

    VoIP,SIP,Asterisk,FreeSwitch,Opensips,Kamailio, Linux,MySQL,PHP,Apache

    India - Last active: 4 days ago - Tests: 6 - Portfolio: 5

    Over the last 4.5 years, I have developed a wide range of IT solutions including VoIP, Web and Mobile development for small businesses and startup companies as well as for large companies. I have experience in VoIP, FreeSwitch, Opensips, Kamailio, Asterisk, FreePBX, A2billing, Linux, Opensource Consulting, MySQL, PHP, Joomla, Android, asp.net-mvc, c#, .net-framwork etc. I have developed class4-class5 Soft Switches, SIP Proxy, FAX Servers, Fax2mail, Fax over IP, Messaging Servers, Session Border Controllers, IVR application, Web Applications and many others. My core competency lies in complete end to end IT solutions for VoIP, Web and Mobile technologies.

    $25.00 /hr
    1,502 hours
    4.58
  6. Luis Urrea

    Luis Urrea

    Telecom Engineer | VoIP Network Engineer | FreeSWITCH developer

    Costa Rica - Last active: 08/19/2013 - Tests: 5

    I am a Telecom Engineer and Network Administrator with extensive experience in designing, implementing and maintaining mission critical network based systems. I worked for Cisco TAC for a little over 4 years providing high level technical support for Cisco Systems customers worldwide, diagnosing and resolving complex issues in small and large scale converged VoIP networks. My years of experience with multidisciplinary groups, and diverse network based equipment, using debugging tools and lab simulations have consistently trained my analytical skills and given me the required background to understand how systems work and therefore be able to provide solid recommendations and identify solutions that meet customer's needs. I am passionate about developing robust, scalable, distributable and fault tolerant communication systems and applications using the Erlang programming language. Programming proficiency in Erlang and Ruby.

    $38.89 /hr
    130 hours
    5.00
  7. Thiago M.

    Thiago M.

    Java/Perl/ Linux/Voip/Asterisk/Opensips

    Brazil - Last active: 09/22/2013 - Tests: 1 - Portfolio: 1

    Last 14 years I worked as Internet Provider admin, with linux and perl in Brazil. I worked for 2,5 years as Voip Engineer with asterisk, openser and opensips in Australia. Worked for 1,5 years in Japan with Flex, now, I'm back to my home in Brazil, with my family working with Flex and Java at my new company a00s.com. We make software ERP to manage money and accounting for business companies. At my free time I like to discovery things by programing, some times with stock markets, some times like now, looking for math formula for prime numbers. I'm looking for some freelance job to increase my incomming, Once I want to go again to japan in this 2013.

    $27.78 /hr
    418 hours
    4.99
  8. Yuriy N.

    Yuriy N. Agency Contractor

    Freeswitch/Asterisk/OpenSIPS/Kamailio/Linux/Network/VoIP Enthusiast

    Russia - Last active: 09/05/2014 - Tests: 1

    Telecom Software and Network Engineer more than 6th years in companies - communication providers. I have extensive experience with deploying a complete infrastructure of voip provider, using OpenSource telephony technologies such as freeswitch, asterisk, OpenSIPS\Kamailio, kazoo, etc. Mostly I'm dealing with emerging startups or with small but accomplished voip companies which want to improve\reorganize their infrastructure; create something new or fix some issue on their network. So it is main area but sure I can help with other projects that correspond to my list of skills.

    Associated with: Nasida

    $40.00 /hr
    1,118 hours
    4.97
  9. Younas Y.

    Younas Y. Agency Contractor

    VoIP/Web Developer

    United Kingdom - Last active: 10/14/2013 - Tests: 1 - Portfolio: 5

    Seeking contracts/projects of VOIP Development with Web Enhancements. where I can use my technical competencies in web, networking and voice applications developing and improving the performance of the company. My skills are as follow. Skills: - AGI, AMI , CTI, PHP/MYSQL , CakePHP, Croogo, WordPress, Joomla, Open Cart. PBX:- Asterisk , FreePBX, TrixBOX, FreeSwitch, VoIPSwitch. Billing:- A2Billing, A2Billing Customization, A2Billing Integration, A2Billing Redesigning ,Custom Billing Solutions. IVR :- DTMF IVR, Voice Recognition IVR, Payment Gateway Integration with IVR, IVR Survey, IVR booking system and at any level of IVR development. SMS:- SMS Web Integration, 2way SMS. SMS integration with A2Billing, SMS integration with IVR. Web Development:- CakePHP, PHP - MySQL, Croogo, Wordpress, Joomla. Termination: SMS Termination , Call Termination using hypermedia Gateway, Eurotech Gateway ,etc. and Custom Built Gateway's. I have the ability to learn new technologies through the use of self-study materials and intuition. I pay close attention to details while performing technically detailed tasks.

    Associated with: VoxLeaf

    $40.00 /hr
    80 hours
    5.00