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SIP Upwork freelancers typically receive a client rating of 4.47.

Last updated: October 1, 2015

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Ivan M.

Ivan M.

Expert .net programmer with sip and xmpp experience

Croatia - Tests: 5 - Portfolio: 3

To create elegant and flexible software that is easy to understand and easy to extend and is easy to use.To make a difference. I am an expert C# WPF programmers who is very adept in design patterns, OOP and communication technologies like sip and xmpp.

$55.56 /hr
4,009 hours

Yasir Star

Yasir Star

Network/System/PBX Engineer

Pakistan - Tests: 2 - Portfolio: 5

I am Telecommunication Engineer. I have 04 years and 10 months experience in EPABX, IP Networking, IT, Telecommunication, SDH, IP Telephony, GSM, Optical Fiber Transmission. I also have experience in following areas: Computer Hardware/Software, Online Technical Support, Phone Support. I am Certified Engineer From Cisco and Alcatel-Lucent. I can work with Technical/Non-Technical Challenges. I can provide Online Support for given Task.

$8.00 /hr
4 hours

Sergey P.

Sergey P.

VoIP and Linux Engineer

Russia - Tests: 5

OS: linux (gentoo, debian, centos ...), FreeBSD over 10 years using/administration Lang: perl, lua, shell (java, ruby, erlang studying) VoIP: asterisk, freeswitch, gnugk, kamailio/ser (over 7 year administration) PBX: Si2000 (v.5), Definity administration (SS7, ISDN) DB: mysql, postgresql Sec: DMVPN, IPsec, OpenVPN Publish: LaTeX

100% Job Success
$30.00 /hr
76 hours

Sukesh Kumar

QA Engineer,Manual Testing,VOIP,SIP,SIPp,Pbx,

India - Tests: 2 - Portfolio: 1

A dedicated professional with around 5 years of experience in Telecommunication Industry (Product Testing) with strong combination of technical expertise , Customer focused, problem solving, and analytical skills. Experience in Protocols: VOIP,SIP,H323,RTP,SDP...etc Experience in configure: Asterisk PBX,Freeswitch Pbx,TekSip,3CX,Avaya CM/SM....etc Presently associated with Avaya India Pvt. Ltd, Pune as QA Engineer. Experience in manual testing for software applications, products and components. Deft in handling functionality testing, system testing, user acceptance testing and regression testing. Well versed with Regression Testing, Performance Testing, System Testing, Functional Testing and Interoperability Testing. Quality exposure in the quality processes of defect prevention, metrics collection and SLA management.

$16.67 /hr
18 hours

Vijay singh R.

Vijay singh R. Agency Contractor

Expert in SMS gateways (Twilio, Plivo), OpenVBX, SIP

India - Tests: 8 - Portfolio: 8

A results-driven, customer-focused, articulate and analytical Software Engineer . Strong in design and integration problem solving skills. Expert in Twilio,NopCommerce,C#,,ASP.NET 3.5/4.0/4.5, MVC 4.0, WCF, SQL Server 2000-2008-2012, JavaScript, HTML, AJAX and web 2.0 best practices.Expert in working on payment gateways like PayPal Integration and Various API integration. **During my development experience, I have abundance working experience with SMS API integration and development projects in .NET and PHP where I have implemented functionalities like: - Inbound/Outbound Call/SMS - Group SMS - Call recording - Call forwarding - Reporting etc.. I also have hands on experience in the following areas: MS Technologies, Ajax, Jquery, OOPs, and software design. •Worked in technologies provided by .Net Framework like Web applications, ASP.NET, AJAX. •Have worked on various market standards and followed best practices like XML, CSS, JavaScript, Jquery. •Have worked on web application that follows 3-tier architecture. •Good experience in Database design and SQL Server 2005 including developing stored procedures, taking database backups and restoring them. •Having good skills in converting business problems into technical solutions. •Having good ability in learning new things and applying them at work. •Having good experince in communicating with clients and understanding requirements. •Having good skills in team management, distribution of taks, project management.

Associated with: Kindlebit Solutions Pvt. Ltd.

86% Job Success
$14.00 /hr
2,231 hours

Kirill P.

Kirill P.

Asterisk Expert and System Administrator

Russia - Tests: 10

I work on IT more than 12 years. VOIP/Asterisk Developer, Expert System Administrator and Network Administrator, Perl Programmer. Generally, I develop solutions based on Asterisk and speech technologies (speech synthesis and speech recognition systems), complex IVRs, integration with external sources and databases, custom click-to-call and callback systems, etc. I prefer custom development for Asterisk and FreeSWITCH. Usually, I use Perl for development. I have huge experience in solutions based on Asterisk such as FreePBX, Elastix, Trixbox, vicidial, etc. Also I support critical 24x7 systems, administration networks and servers, perform IT consulting, etc.

100% Job Success
$25.00 /hr
47 hours

Ruben Semerjyan

Ruben Semerjyan

Inovative Mobile VOIP, Social, Audio/Video Streaming Developer

Armenia - Tests: 2 - Portfolio: 1

I am an innovative, extremely detail oriented and perfectionist Software Development Architect, with expert knowledge in VoIP, audio/video streaming and processing, messaging and social media. My a little over 8 years of experience in VoIP industry gave me a strong knowledge of the protocols, technologies and available solutions. 3 years of successful mobile applications development, architect and project management gave me confidence in creating robust and technologically challenging applications. I am passionate about developing robust, innovative and leading edge applications, getting increasingly challenging assignments and applying disruptive technologies. Looking for a work on technologically challenging projects (in an agile environment preferably), while offering my expert knowledge base, ability to learn quickly and apply new techniques. I usually bid slower than others, because of reading the full job description, trying to estimate all requirements, needed technologies and solutions.

100% Job Success
$25.00 /hr
28 hours

Arsen S.

Arsen S.

VoIP Administration & Development

Bulgaria - 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.

100% Job Success
$55.56 /hr
199 hours

Volodymyr S.

Volodymyr S. Agency Contractor

Senior front end developer (HTML, JavaScript(Angular, Ionic), Flex

Ukraine - Tests: 2 - Portfolio: 3

Over last 9 years I have been working in IT. Last 3 years I have been developing on JavaScript (angularjs, ionic, knockoutjs, backbonejs, jquery, jqueryUI, jquery mobile, google maps API etc) Before javascript I developed 6 years on Flex and ActionScript. I have been working on more than 10 projects (big teams) for big companies (from Great Britain, USA, Canada, Belgium) Small knowledge of Java, PHP, SQL. Have experience in SIP/Wowza/Red5/AMS/AMG

Associated with: TSF Solutions Agency

100% Job Success
$27.78 /hr
4,465 hours

alexander Merkulov

alexander Merkulov Agency Contractor

Asterisk/voip/a2billing/freepbx/kamailio expert

Ukraine - Tests: 6 - Portfolio: 5

My time is my value. So when you choosing me you can expect that job will be done in short terms and perfect. I not like to do something that not need be done, i prefer use developed components and solutions. That not mean i can't do development. I working with different programing tasks for last 26 years. yes, from 6 y.o. I live in it. So i prefer do something new&interesting; I can handle all tasks from linux administration/virtualization upto end-user web for voip. Only task i never do - graphical design part. That is not my field, better hire someone else for design. I have university degree, working with asterisk from start of this project. Have developing experience with freepbx/trixbox&a2billing. I am one of contributor of trunk. Also i can work as mysql/postgres DBA, database architect, has experience with following languages: Perl Python PHP C/C++ Javascript SQL Prolog/Lisp,Forth. In voip i can work with callweaver, asterisk, opensips, kamailio. Developed modules for freepbx, elastix, trixbox, a2billing.

Associated with: UA Prime Agency

92% Job Success
$67.77 /hr
546 hours