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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, 29 SIP projects are completed every quarter on Upwork.


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 4.47.

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

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
4,433 hours

Sergey A.

Sergey A.

VoIP CallXML developer

Russia - Tests: 10 - Portfolio: 9

I am focused on efficiency of software development. I am improving my efficiency every day with great success. I am independent freelance developer with 10+ years experience, I can be responsible for your project. High quality of code is guaranteed. My favourite technologies are StarTrinity CallXML (VoIP scripts), WPF, AJAX, WPF, MVVM, Entities Framework. Over last 13 years I have successfully developed a wide range of applications for various businesses using C#, WPF, audio/video media processing and streaming, voice/text chats, Text-to-speech, C++, SIP, RTP, TCP/IP, HTTP. Now I am willing to help you with your project fulfilling if you know what you want and if you have good understanding of what you need. With current employers I work trying to save their money and time by telling them about possible problems before the problems happen.

100% Job Success
$10.00 /hr
5,942 hours

Ismir S.

Ismir S.

VoIP/Asterisk/FreePBX/Cisco/Linux Specialist

Austria - Tests: 5

VoIP and network engineer/administrator with more than 6 years of experience in design, planning and implementation Unified Communication and IP centrex solutions, large scale telephone and Cisco data networks. Deep understanding of asterisk PBX, FreePBX, Elastix, SER and OpenSER/Kamailio SIP servers. Fluent in SIP, SS7, IAX, RTP, T38, ISDN, STUN, SDP, Ethernet, TCP/IP, DHCP protocols, Cisco routing (BGP, OSPF), switching, LAN, WAN, ACL, QoS, VLAN.

$38.89 /hr
1,059 hours

Junaid Rehmat

Junaid Rehmat Agency Contractor

Experienced C/C++/Objective C Developer/iPhone Application Developer

Pakistan - Tests: 3 - Portfolio: 5

Over the last 4 years, I have developed a wide range of projects using C, C++, Objective C, and Java. My core competency lies in iPhone Application Development. I have developed more than 15 major applications, including VOIP applications, social networking apps, drawing apps and/or a few apps with custom UI and self management features. I have hands on experience in iOS Application Development. I have developed many live applications. - Expertise in iOS (6.x, 5.x, 4.x) - Expertise in xCode (4.x, 3.x) - Expertise in VOIP applications using PJSIP and Doubango. - Expertise in XMPP Framework. - Expertise in Facebook, Twitter and LinkedIn APIs - UIKit Framework - UIMapKit Framework - Addressbook Framework - QuartzCore Framework - CoreAnimation Framework - AudioPlayer/MoviePlayer Frameworks - Client‐Server communication - Database designing using SQLite - PDF document reading - Inapp Purchase integration - MessageUI and MailUI Frameworks - JSON and XML Parsing. - Using GET, POST and SOAP web services. - Using Gesture Recognizer and UITouch controls. - Customizing User Interface.

Associated with: AgileOne

100% Job Success
$20.00 /hr
1,512 hours

Malay Patel

Malay Patel

VoIP/SIP, PHP Yii, MySQL Administration & Development

India - Tests: 7 - Portfolio: 3

Over the last couple of years, I have developed a wide range of IT solutions including VoIP, Web and Mobile development for small businesses and start-up companies as well as for large enterprises. Following are my area of experiences: -VoIP, SIP -FreeSwitch, ASTPP -Opensips -Kamailio -WebRTC -RTPproxy, RTPengine -Asterisk, FreePBX, A2billing -Linux & Opensource Consulting -MySQL, PHP, Wordpress, Apache -Android I provide following services: - Development of custom VoIP solutions with ongoing support - VoIP networks/projects: development and optimization - High Availability and Scalability solutions for VoIP networks. - VoIP Security and Hacker protection solutions. I provide 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 Messaging Server, SIP Redirect Server, SIP Load Balance & Fail-Over -IVR Application -Fax over IP (FoIP), T38 Supported FAX Server, FAX to Email -Shoutcast Server -WebRTC 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.

90% Job Success
$25.00 /hr
1,760 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
2,210 hours

Suren Karapetyan

Suren Karapetyan

Senior System/Network Administrator (devops)

Armenia - 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.

97% Job Success
$45.00 /hr
1,160 hours

Yuriy N.

Yuriy N. Agency Contractor

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

Russia - Tests: 1 - Portfolio: 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

100% Job Success
$40.00 /hr
1,118 hours

Abdelghafour H.

Abdelghafour H. Agency Contractor

Software developer

Morocco - Tests: 4

I'm a network, software developer, I have consequent experience in LAN/WAN protocol's configuration, I worked also on setting up and configuring IPTV and VoIP platforms, I developed many WEB architecture using J2EE, Ruby On Rails, Python Django and NodeJS. My goals through upwork is to create a trust based network of clients with whom, I can have a long term relationship developing solutions that best suit their needs.

Associated with: Teliteck

100% Job Success
$33.33 /hr
1,348 hours