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Laszlo B.

Linux Sysadmin/Asterisk,Openser,Kamailio,Opensips developer/CISCO exp


Szolnok, Hungary


Speed and quality are my second and third names Escrow on start, released upon completion, no exceptions! I don't stop until your project is done. I don't want to be involved in projects promoting porn, aggressive marketing, spamming, etc! I've lost count of the number of VoIP/Linux/Cisco installs and upgrades and modifications I've carried out. I'm also a developer member of various VoIP projects so I'm able to offer much more value and choice in all areas of VoIP eg. custom Asterisk modules, modifying Openser(Kamailio) or Asterisk's source code to make custom features, etc. I am not one of the many bidders who bid for everything with a ... moregeneric sales pitch. I specialize in VoiP/Cisco/Linux only and do not work with anything else. I also support all my work for 6 months after completion in case of upgrades etc. for a low price. Summary - 13-year experience with VoIP engineering, over 13 years with IP networks - Certified Cisco Network Administrator - Hands-on with VoIP and telecom equipment, standards and technologies - Wide range of successfully deployed VoIP services and applications - Strengths in implementation of complex projects paying attention to details - Creative problem solver, high degree of initiative - Analytical skills to examine data and provide the most efficient solution Technical Expertise Signaling protocols: SIP, H.323, MGCP, ISDN, SS7,R2 Soft-Switches: Nextone MSW, Cisco PGW, OpenSER, Teles TDM switches: Lucent LCS/Plexus, Harris VoIP gateways: Cisco AS-series, Quintum Tenor/CMS, Patton SIP phones: Cisco, Grandstream, Sipura, Snom, Asterisk Voice applications: Wholesale, ITSP, calling card, call shop, IVR, PBX, pre/post-paid billing, Asterisk2Billing, IP trunking, VoIP load balancing, voip bandwidth saving, custom C++ coding for Asterisk, Opensips, custom Asterisk and OpenSER/Kamailio/OpenSIPS modifications, Sipwise SPCE configs, OpenVox and Digium cards installation and configuration, fax to email, email to fax solutions, fax over ip IP networking: LAN/WAN connectivity, QoS, ATM/DSL, Cisco Routers (800, 1600, 2500, 2600, 3600, 6500/MSFC, 7200, 12000) and Switches (2900, 3500, 4000, 6500). Protocols: IP (Unicast and Multicast), BGP, EIGRP, OSPF. SONET/SDH (on an International network up to OC48/STM-16, including DWDM) - Cisco ONS15454. Leased lines (Kilostream, E1, E2, E3, T1, T3) Unix technologies: -Extensive knowledge and understanding of the various flavors of UNIX including: Debian, IRIX 5.2 - 6.4, Sun Solaris 2.x, HP-UX 8.x-9.x, Dec Ultrix 4.x, NetBSD, FreeBSD, AIX, Convex, OSF, Linux Suse 6.x - 7.1/Redhat 7.x - Enterprise - System installation, configuration, tuning and patching, accounting, security, monitoring, performance analysis device drivers, kernel configuration & patching, policy and politics - SLIP/PPP, LPD, LDAP, UUCP, RPC, BOOTD, SWAP, DHCP, DNS, INETD, NFS/NFS+, NIS, SH, BASH, KORN, REGEX, AWK, SUID, CRON, SYSLOG, etc. VoIP: Asterisk, Switchvox,OpenSER, Kamailio,OpenSIPS,TrixBox, FreePBX, Vicidial, Switchvox, A2Billing, Cisco Call Manager, Portaswitch and so on... - Architecture of high-load web-projects - Work in distributed development and operations teams including 24/7 on call duty - MySQL database administration (replication clusters, scalability techniques, optimization, backup) - All kinds of systems and networks administration (configuration management, automatic provisioning, load-balancing, load-distribution, high-availability clustering) Familiar in cloud development with using Openstack, Puppet, Razor and Cobbler. As you can see, I can do pretty much anything in VoIP, Cisco and Linux :) I have a positive attitude toward change and learning - I'm ready at anytime to suggest new ideas to get your project done creatively! You may also find us at http://voipfreak.net less

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Work History and Feedback

  • Mar 2014

    System Developers to Kamailio – the Open Source SIP Server
    Good work and good skills, but too busy to finish the job as agreed.
    4 hours
    $38.89 / hr
    $162.04 earned

  • Apr 2013 - May 2013

    TrixBox Administrator
    Great knowledge and understanding of what needed to be done but after an extended period of no contact we had assume he was not interested in completing the project or was unable to complete. A real shame.
    4 hours
    $33.33 / hr
    $127.76 earned

  • Aug 2009 - Sep 2010

    Asterisk Developer for Existing and Future Work
    1 hour
    $13.33 / hr
    $6.67 earned

  • Aug 2009

    PHP Interbase update
    Laszlo done an excellent work for us. Very fast and perfect communication. Recommended!!
    $16.67 earned
    Fixed Price

  • Aug 2009

    Cacti - Generate graphs
    Task has been done very quickly and Laszlo knew what he was doing.
    $33.33 earned
    Fixed Price

  • Aug 2009

    Mysql performance tuning
    Excellent skills, prompt responses. Hope work with him again.
    $11.11 earned
    Fixed Price

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Name Score (out of 5) Time to Complete
Upwork Readiness Test for Independent Contractors and Company Managers 4.20 Below Average 5 mins

Work History

41 hours worked
16 jobs


More than 30 hrs/week


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