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ivan381eu

and invite this freelancer
Flag of Serbia Belgrade, Serbia
It's currently I'm Online! I'm Offline
Member since January, 2011

Basic services: custom VoIP system design, VoIP billing, custom Web GUI for Asterisk appliances. I can handle any request related to VoIP servers, Asterisk PBX as well as specific Asterisk appliances (FreePBX, ViciDial, GoAutoDial, TrixBox). For more then 600 simultaneous calls I recommend SIP server Kamailio with many Asterisk nodes behind. - small and large VoIP system based on SIP, IAX, - VoIP architecture design - Web GUI and billing for VoIP - support for Asterisk, FreePBX, Trixbox, A2Billing, OpenSER (Kamailio or Opensips). - custom add ons for Asterisk, FreePBX, A2Billing - VoIP load balancing using OpenSER (Kamailio or Opensips) - support for Linux systems and suplimentary services for VoIP - "on call" support and consulting for all above

5.0 / 5
6.7 / 10

@ivan381eu

  • 84%Jobs Completed
  • 100%On Budget
  • 100%On Time
  • 40%Repeat Hire Rate

Top Skills

  • PHP
  • Asterisk PBX
  • MySQL
  • Linux
  • VoIP
  • Software Architecture
  • System Admin
  • SQL
  • Database Administration
  • AJAX
  • Perl
  • Javascript
  • XML
  • Data Processing
  • Data Entry
  • Excel
  • Web Scraping
  • CMS
  • jQuery / Prototype
  • eLearning
  • OCR
+ show more

Recent Reviews

  • image of DavidLifson Application Development Programming €4797.00 EUR

    “Ivan is a pleasure to work with. Communication is very important and Ivan understands that this essential to the success of a project. He ask questions when appropriate and communicates his progress.”

    DavidLifson Flag of Canada 11 months ago.
    • PHP
    • Software Architecture
    • Asterisk PBX
    • MySQL
    • HTML5
  • image of telef REST server & Asterisk SIP-URI call €355.00 EUR

    “supernicework”

    telef Flag of Sweden 1 year ago.
    • Asterisk PBX
    • Hire me
  • image of mattl ViciDial campaign import customizing $350.00 USD

    “since completing this project I have done 2 others with him. I really enjoy working with a developer who does not stop at any obstacle. Thanks Ivan!”

    mattl Flag of United States 1 year ago.
    • PHP
    • Asterisk PBX
    • Hire me
  • image of DavidLifson Application Development [Sealed]

    “This guy is great. He has excellent knowledge and does not bullshit. I would highly recommend him for your project unless he is doing another one for me!”

    DavidLifson Flag of Canada 1 year ago.
    • PHP
    • Software Architecture
    • Asterisk PBX
    • VoIP
    • MySQL
  • image of cconroy A2Billing Intigration Phase 1 $219.00 USD

    “Ivan continues to impress me in the knowledge and skill that he has. He is upfront clear and ther is no misunderstanding. Working with Ivan allows me to assign tasks and know that they will be completed without having to follow up. Target dates are met and timelines are provided.”

    cconroy Flag of United States 1 year ago.
    • PHP
    • Asterisk PBX
    • VoIP
    • MySQL
    • Hire me
  • image of kam303 Linux based Dialler $900.00 USD

    “Project was executed excellently, and in line with project description, very pleased with results and with Ivan's willingness to go beyond what is required and help with what ever he can. Look forward to working with him on future projects.”

    kam303 Flag of United Kingdom 1 year ago.
    • PHP
    • Software Architecture
    • MySQL

Experience

VoIP Consultant

Oct 2010 - Apr 2012 (1 year)

- VoIP cluster monitoring, traffic over 10k+ minutes monthly, - Project Management (VoIP Call back solution, DID traffic failover improvement), - Consulting (Advice on new and existing, voice and video services)

Project Manager

Sep 2007 - Jul 2010 (2 years)

- SIP server monitoring system, - SIP server adaption for communication via protocol - Ministry of Foreign Affairs of the Republic of Serbia - autonomous telecommunication system (numeration indepedent from local Telco, interoperability with Siemens, Avaya, Panasonic PBXs via ISDN PRI), - VoIP call back solution (PSTN & GSM to VoIP) - Centralized monitoring system for 50+ Asterisk IP PBX installations, - Asterisk based Call center solution design, - Asterisk IP PBX customized solutions, - Mass

Education

University of Belgrade - Faculty of Mathematics

1987 - 1991 (4 years)

Certifications

Red Hat Certified Security Specialist (RHCSS) (2010)

An RHCSS certification may be earned by a Red Hat Certified Engineer (RHCE) who has demonstrated deeper capabilities in networking services security, directory services, authentication, and SELinux policy management. An IT professional who earns an RHCSS certification has met the security requirements for today's enterprise environment.

Publications

IT weekly "COM"

During the 5 years period I published number of articles about Linux, Web services, VoIP security, Asterisk appliances, Kamailio SIP proxy, MySQL clustering etc.

Badges

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    Complete 5 or more projects, with a 95% completion rate.
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    Create 50 Milestones.
  • Smooth Operator

    Complete 10 projects on time.
  • Warren Buffet

    Complete a project worth over $1000 USD.
  • Pro-Profile

    Complete your Profile 100%.
  • The Economist

    Complete 10 projects on budget.
  • Nine-to-Fiver

    Win a project and accept the offer.
  • The Critic

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  • Feedback Guru

    Receive 10 reviews
  • Perfectionist

    Receive 5-star ratings in 90% of your completed projects (minimum 10 projects).
  • Smart Money

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  • Fast Responder

    Bid within 2 minutes of a project being listed.
  • High Roller

    Complete a project worth over $500USD (or equivalent) on Freelancer.com.
  • Backup plan!

    Verify a backup payment method
  • The Verified

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  • The Collector

    Reach a balance of 5,000 credits.
  • The Adventurer

    Complete your first project.
  • All Star

    Receive a 5-star rating for a project.
  • Grand Tourer

    Visit all recommended features that Freelancer.com offers
  • The Enforcer

    Reporting a project or contest that violates our terms of service.
  • The Seeker

    Bid on 20 projects.
  • Insta-Hire

    Use Hire Me to employ a Freelancer.
  • The Perfectionist

    Edited a bid.
  • Mover and Shaker

    Create 50 Milestones.
  • Warren Buffet

    Complete a project worth over $1000 USD.
  • The Collector

    Reach a balance of 5,000 credits.
  • The Cap-tain!

    Reach the level 20 level cap!
  • Simply the Best

    Complete 5 or more projects, with a 95% completion rate.
  • Smooth Operator

    Complete 10 projects on time.
  • The Economist

    Complete 10 projects on budget.
  • Perfectionist

    Receive 5-star ratings in 90% of your completed projects (minimum 10 projects).
  • Smart Money

    Create 10 Milestones.
  • High Roller

    Complete a project worth over $500USD (or equivalent) on Freelancer.com.
  • Backup plan!

    Verify a backup payment method
  • All Star

    Receive a 5-star rating for a project.
  • Grand Tourer

    Visit all recommended features that Freelancer.com offers
  • The Regular

    Log in every day for 1 week.
  • Pro-Profile

    Complete your Profile 100%.
  • Nine-to-Fiver

    Win a project and accept the offer.
  • The Critic

    Post 10 Reviews.
  • Feedback Guru

    Receive 10 reviews
  • Fast Responder

    Bid within 2 minutes of a project being listed.
  • The Verified

    Verify your payment method
  • The Adventurer

    Complete your first project.
  • The Enforcer

    Reporting a project or contest that violates our terms of service.
  • The Seeker

    Bid on 20 projects.
  • Insta-Hire

    Use Hire Me to employ a Freelancer.
  • The Perfectionist

    Edited a bid.