SIP Freelancers

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SIP Job Cost Overview

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

Upwork SIP Jobs Completed Quarterly

On average, 34 SIP projects are completed every quarter on Upwork.

34

Time to Complete Upwork SIP Jobs

Time needed to complete a SIP project on Upwork.

Average SIP Freelancer Feedback Score

SIP Upwork freelancers typically receive a client rating of 4.50.

4.50
Last updated: May 1, 2015

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  1. 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
  2. Kirill P.

    Kirill P.

    Asterisk Expert and System Administrator

    Russia - Last active: 7 days ago - 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.

    $25.00 /hr
    10 hours
    5.00
  3. Petr Kudinov

    Petr Kudinov

    Russia - Last active: 1 day ago - Tests: 4 - Portfolio: 1

    I'm professionaly programmer from 1997 (started on Pascal/C/FoxPro). Other the years i've developed billing systems for mobile operator and ISP, websites and very specific VOIP services. I have configured and supported many of the FreeBSD/Linux servers using Puppet/SaltStack. At this time i'm developing WEB applications using Angular JS or other JS engines on frontend and PHP on backend. I'm have good skills in software design, Javascript/PHP/PERL/C and SQL languages, as well as TCP/IP, HTTP, SIP, H.323, RTP. VCS - GIT/SVN

    $45.00 /hr
    1,631 hours
    5.00
  4. Hector Bravo

    Hector Bravo

    IT Expert - Project Manager - PMP, ITIL, VCP, MCSE, MCDBA, VoIP

    Panama - Last active: 1 month ago - Tests: 13

    Design, Plan, Implement and Support for: - Windows Azure / Amazon EC2 - Microsoft Lync - Microsoft Sharepoint - Microsoft Exchange - Microsoft SQL Server - Microsoft Active Directory, ADFS - Microsoft Dynamics CRM - Windows Server / Hyper-V - Microsoft ISA/TMG/UAG - Microsoft SSCM, SCVMM, DPM - Microsoft Office 365 - Voice Integration with Lync - VMWare vSphere / ESXi - VMWare Site Recovery Manager (SRM) - Veeam Backup & Replication

    Groups: Microsoft Certified Professionals

    $33.33 /hr
    930 hours
    4.56
  5. Suren Karapetyan

    Suren Karapetyan

    Senior System/Network Administrator (devops)

    Armenia - Last active: 1 day ago - Tests: 8

    An ambitious *nix System and Network Administrator with eight years' experience working in ISPs and other service providers maintaining existing and designing new infrastructure. DevOps skills which help to bridge sysadmins' and developers' teams. Master's degree in Math Sciences. I'm looking for interesting projects which use new/young technologies and provide new challenges. Would also be great to work with interesting people.

    $35.56 /hr
    824 hours
    4.91
  6. Raoul W

    Raoul W

    I am a mobile app developer

    Sweden - Last active: 7 hours ago - Tests: 2 - Portfolio: 10

    Hello, Sir. I am a passionate mobile app developer with 5+ years rich experience. I am developing mobile apps since the first iPhone GPS tracker in April, 2010. I have several iOS and Android devices and developed apps compatible with all devices. Over all these years, I have accomplished amazing mobile projects successfully. Here is my skills and experiences in mobile development. - location tracking by GPS on iPhone/Android - Integrate Map using Apple MapKit and Google Map API - find location by geolocation - chat & message engine by XMPP Protocol - voice / video call using SIP Protocol - video streaming by HLS Protocol - photo / video processing - e-Commerce solution integrated with payment gateway - local and push notification As a skilled mobile developer, I will provide professional advice and perfect development solution. There is no problem to build mobile app with any idea or sketch. Thanks.

    $49.99 /hr
    2 hours
    5.00
  7. Gohar A.

    Gohar A.

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

    Canada - Last active: 2 months ago - Tests: 3 - Portfolio: 15

    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
  8. Basit azeem S.

    Basit azeem S.

    OCPJP, Expert in Spring/Hibernat/Java/JEE based Projects

    India - Last active: 1 day ago - Tests: 6 - Portfolio: 10

    I am having 6+ years of professional experience in Design and Development of Java Technology based Desktop and Web Applications starting from Requirement Gathering phase to Testing and Delivery Phase. I have worked with giants like Tech Mahindra, Ericsson etc. as Software Engineer. Right now I am Sr. Software Engineer in a US based company where I am involved in design and development of various Web based projects on financial and telecom domain. My Skill set include - Core & Advanced Java, J2EE, Struts 1&2, Spring (All Modules), MVC 1&2, JSP, Servlets, JSTL, EJB, JSF, SIP Servlets, Web Services, Hibernate, MySql, Oracle, PL/SQL, JQuery, AJAX, DHTML, GWT. I worked extensively on many servers like JBoss, Sailfin/Glassfish, Tomcat, Weblogic on Windows and UNIX environment. I extensively worked on Eclipse and Netbeans and well aware of many Eclipse plug-ins like Debugger, JUnit, SVN/HG Plugin, WTP etc. I have good experience is SCM packages like GIT (GitHub, BitBucket), SVN, Mercurial (Hg). I am well versed with several build tools like MAVEN, ANT.

    $27.78 /hr
    2,111 hours
    4.76
  9. Atif Naveed

    Atif Naveed

    Sr. Software Engineer

    Pakistan - Last active: 1 day ago - Tests: 2 - Portfolio: 10

    Tremendously experienced and enthusiastic mobile application developer with more than 5 years of working experience with various international clients and local companies. Started working for mobile apps development with iPhone3 (iOS3) till now. Accomplish many projects from scratch and re-skin / fixed equally, fast and quick ability to debug, read code and fixing bugs with very good rating from clients. Go getter, easy to work with any team with following Skills: Client Satisfaction, with best result! Detail Orientated work, Ability to work with Complex requirements Rapid ability to work with different Teams Time Management, Time Tracker, Team Management Client Communication Github, SVN, JIRA. Objective-C, iOS development, MVC XCode, iOS, IOS4, iOS5, iOS6 JavaScript, HTML, jQuery, JSON, XML, SQLite, Core-Data, Universal Apps, Multilingual Apps, VOIP, Augmented Reality Map Kit, Google Map Red Laser, Linea, QR Code, Push Notifications iPhone3, iPhone4, iPhone5, iPad & iPad Mini Android SDK, Phone Gap, API development Social Media Integration (Twitter, Facebook, Tumbler, Google+ etc.) Photo Manipulation App development. InApp Purchase, iAd, PayPal, Third Party SDKs integration Flurry, Kiip, Unity3D, Corona SDK

    $33.33 /hr
    206 hours
    4.50
  10. Ruben Semerjyan

    Ruben Semerjyan

    Inovative Mobile VOIP, Social, Audio/Video Streaming Developer

    Armenia - Last active: 1 day ago - 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.

    $25.00 /hr
    28 hours
    5.00