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Last updated: October 1, 2015

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Roman Yerin

Roman Yerin Agency Contractor

Web and VoIP(FreeSWITCH, WebRTC) engineer

Russia - Tests: 4 - Portfolio: 2

I'm a skilled software developer and VoIP engineer with more than 15 years of experience. I'm also a full-stack developer of the convergent systems of voip and web. Playing with Freeswitch, Kazoo, SipXecs, Ruby, Perl, JS(node.js), C/C++ and much, much more - I'm always choosing tools for the task. Probably the most important thing which differs me from others - I'm never working just to gain money. I'm always doing my best to reach your goal the fastest way possible. If you've chosen a non-optimal solution I'll correct it and suggest a more efficient way. I'm never promising something that you're probably expecting to hear instead of the realistic estimate of your project. I'm never lying to my clients and I'm always giving all the information I have - transparently and on a regular basis. In one word - you can trust me as you trust yourself.

Associated with: Coderunes

86% Job Success
$45.00 /hr
618 hours

mohammad kamruzzaman

mohammad kamruzzaman Agency Contractor

FreeSWITCH Expert with Web development Experience

Bangladesh - Tests: 2 - Portfolio: 2

i am a full stack web developer and server administrator (FreeSWITCH) i have experiences on Django (python), Codeigniter (php), MongoDB, ElasticSearch, postgres, redis, rabbitMQ, celery, mysql, nodejs. you can hire me if you need to implement a distributed VoIP enabled service based on freeswitch/kamailio that is ready to scale. i am also doing newfies-dialer customization and maintenance for a long while. and also i will take projects like PBX, IVR, autodialer development. i have open source project customization experiences, for example, FusionPBX,Newifes-dialer,Astpp,vBilling,kazoo, Kannel

Groups: Twilio

Associated with: DT software house

91% Job Success
$44.00 /hr
3,101 hours

Gohar A.

Gohar A.

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

Canada - Tests: 3 - Portfolio: 15

Since last 8+ years 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 Designing and Development * Server Administration * Network Administration * Securing VoIP deployments * Expert at SIP and RTP diagnosis and troubleshooting I've experience in Following tools. * Asterisk * FreeSwitch * OpenSIPs * Kamailio * SEMS * Vyatta * MySQL * Linux OSs I've worked in following languages. * C++ * LUA * Perl * Php * Shell scripting Find More about Me from my VoIP Blog:

100% Job Success
$60.00 /hr
154 hours

Luis Urrea

Luis Urrea

Telecom Engineer | VoIP Network Engineer | FreeSWITCH | Kazoo Expert

Costa Rica - 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.

$50.00 /hr
130 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

Dwibendu M.

Dwibendu M.

6+ Year Hands On Experience in Asterisk,Freeswitch,Vicidial,FreePBX

India - Tests: 3 - Portfolio: 6

I have 6 + Years hands on experience in Asterisk, Freeswitch, Vicidial,Elastix,A2billing,FreePBX,GoAutodial,OsDial,TrixBox,FusionPBX,BlueBox,2600Hz,vTiger CRM,Sugar CRM, FAX integration and other VoIP related technologies. Advanced Dialplan in asterisk,a2billing,Voice Broadcast,Click2Call,Press 1 Survey,Conferencing Solution,VoiceMail,Realtime DB Integration and IVR specialist. Useful and cost-effective phone management system planning & designing & installation for Call center setup using open source telephony. Expertises in Digium, Sangoma,Allo,Openvox and other type of PRI & PSTN Card installation as well as VOIP Setup From Scratch. Connecting Multiple Asterisk Server,Clustering & Cloud Solution for asterisk,Expertise in Virtualization like AWS,OpenVz,Vmware ESXI,VitualBox,KVM. Networking Knowledge like Windows,Linux Server administration and optimization (WLAN, LAN, VPN, WAN, WDS, VPS, TS, VoIP) Strong Knowledge in Router(Cisco),Firewall(Sonicwall,Checkpoint,Cyberoam) and Windows Server 2008 R2(AD,DHCP,DNS,IIS,Terminal Services) and also in Network Monitoring Tools Like Nagios,Cacti,MRTG. We have modified Vicidial and also do customization according to business need. I have deployed more than 500+ Vicidial & PBX all across the globe.Also Deployed Clustering server for more than 300+ user in vicidial. Our Team is giving 24*7 support to call centers in USA,UK,AUS,Philippines,India,Some European Country. I can assure 100% satisfaction and delivery of the projects.

$11.11 /hr
21 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

Zhong W.

Zhong W.

Perl hacker and Voip Expert

China - Tests: 5

I have more than 8 years working experience of voip industry. i am proficient in Asterisk, Freeswitch, Kamailio,Fusionpbx, A2Billing, Freepbx,Freeside and Linux Administrator. And i have planned and built dozen multi-tenant carrier pbx. i have been always supporting two muti-tenant carrier pbx systems based thirdlane and FusionPBX which both have more than 500 concurrent calls and 3000 registrations extensions. I am able to coding with C/C++, Perl, PHP, shell, sql and other programming language. And I have done sucessfully about 30 jobs about voip system on upwork . I am steady, honest and hard-working. I am fond of innovation and pursuiting new techonologies.

100% Job Success
$27.78 /hr
2,721 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