Immagine di profilo di Asterisker
@Asterisker
Membro dal 11 agosto 2016
4 Raccomandazioni

Asterisker

In linea Non in linea
Work with VoIP and PSTN, experience with the signaling protocols: SIP, SDP, RTP, IAX2, H323, SS7, TLS, SRTP. Interfaces DAHDI, AMI, AGI, PRI. Setting up and supporting Call centre, about 30 operators. Setting up VoIP using Freeswitch, Asterisk, Kamailio, dialplan creating, developing FreePBX module code, PHP, bash. Assisting developers with any service-related issues or feature requests. Reporting based on CDR, CEL, queue_log database data. Configuring VoIP gateways Cisco, Addpac, Linksys, Snom, Polycom, GrandStream. PSTN ATS Panasonic KX-TDA. Auto-provisioning with xml files via TFTP, HTTP, HTTPS protocols with own Web GUI. Testing with SIPp. Debuging with Voipmonitor, Homer, sngrep, tshark. Data quality for associated reporting systems. Configuring and monitoring VoIP equepment with Zabbix, Nagios, Monit, MRTG Extensive experience administering Linux [login to view URL] Apache, NGINX, DNS DHCP TFTP MySQL. Some experience with virtualization on VMware ESXi
$14 USD/hr
49valutazioni
5.2
  • 100%Lavori Completati
  • 100%Nel Budget
  • 100%Puntuale
  • 21%Tasso di Riassunzione

Portfolio

Recensioni Recenti

  • immagine di Eugene D. Project for Sergey S. $75.00 USD

    “Sergey pays attention to detail. Easy to work with. I have hired Sergey for many projects and received the best service and communication beyond anyone else here.”

  • immagine di Nestor B. Project for Sergey S. -- 2 $42.00 USD

    “Excellent professional, very easy to work with.”

  • immagine di Nestor B. Project for Sergey S. $14.00 USD

    “Excellent work, great communication, very knowledgeable. I’ll definitely be using him again.”

  • immagine di Marcello B. FreePBX Plugin that collects data from a user after IVR $450.00 USD

    “Sergey was fantastic, he was able to develop a FreePBX module fast, and it works perfectly. His English was almost fluent, as well as being very friendly. He communicated well with me about the project and gave me regular status updates, which is not something I am used to when it comes to freelancers. After working with him once I plan on having him do many more projects for me in the future. I would hire him full time if I could!”

  • immagine di Eliraz A. Bitrix integration $32.00 USD

    “sergei is very professional and dedicated programmer, he did the project on the best side and delivered the product working as asked. thanks a lot sergei .”

  • immagine di Edgar R. FreePBX module $20.00 USD

    “Проект выполнен в срок и в рамках бюджета”

Esperienza

Senior VoIP engineer

Nov 2014

[login to view URL] Asterisk, Freeswitch, Kamailio maintainig. SIP traffic debug and troubleshooting.. Support team job. Soft switch tests. Analysis of such parameters as ASR, ACD. Work with MVTS-II soft switch.  Using system NetSense and scripts iperf, SIPp. Monitoring with Nagios and Zabbix.

VoIP engineer

Jan 2011 - Nov 2014 (3 years)

Work with VoIP and PSTN, experience with the signaling protocols: SIP, SDP, RTP, IAX2, H323, SS7, TLS, SRTP. Interfaces DAHDI, AMI, AGI, PRI. Setting up and supporting Call centre, about 30 operators. Setting up VoIP using Asterisk, dialplan creating, developing Asterisk code, PHP, bash. Assisting developers with any service-related issues or feature requests. Jointly managing a network of 300 phones. Reporting based on CDR, CEL databases data.

Head of IT Department

Jul 2009 - Dec 2010 (1 year)

Administration of local corporate network in the city of Irkutsk. Work with equipment Cisco, D-link. Administration of the DNS, mail servers and billing running by Windows 2003 server, FreeBSD, RedHat. Knowledge of the basic routing protocols, TCP/IP protocol stack, as well as the principles of switching technology VLAN, VTP, STP.

CTO

Nov 2004 - Dec 2010 (6 years)

Participation in the project of constructing the optical transport network in the city of Irkutsk, maintenance of the existing operator's network. Administration of switches and routers of the company Cisco. Administration of the DNS, mail servers and billing running by Windows 2003 server, FreeBSD, RedHat. Knowledge of the basic routing protocols, TCP/IP protocol stack, as well as the principles of switching technology VLAN, VTP, STP.

Istruzione

Bachelor's degree

1991 - 1996 (5 years)

Qualifiche

Certificate "Design networks" from company "D-Link Russia" (2012)

D-Link

network administration

Certificate "Design VoIP networks" from company "D-Link Russia" (2011)

D-Link

VoIP administration

Certificate "Asterisk. Level 2. The phone systems and securety" (2017)

Specialist

36 hours of lections and labs

Certificazioni

  • Unix Level 1
    95%
  • US English Level 1
    92%
  • Numeracy 1
    87%
  • Preferred Freelancer Program SLA
    84%

Verifiche

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