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On average, 39 SIP projects are completed every quarter on Upwork.

39

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SIP Upwork freelancers typically receive a client rating of 4.48.

4.48
Last updated: July 1, 2015

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  1. Juan Pablo Lorenzetti

    System Enginner

    Belize - Last active: 23 days ago - Tests: 2

    i have more than 10 years experience in the telecommunication field. (mostly in small companies, a 1 man IT dept.) Skills on: 1. administering and setting up platforms for services (prepaid cards, IVR, sms, etc) 2. developing software to perform tasks and/or provide services. 3. Strong background developing using open source software for different tasks/services. 4. Web development using php/javascript (jquery, etc) 5. strong knowledge in the linux OS and its tools (automating tasks, bash scripting,etc) 6. strong knowledge in the C/C++,pyhton,perl,java. 7. Integration of platforms/services. Latest projects of the past 3 years (list is too long otherwise): 1. Implemented a AAA, using open source software, for a 3G WCMDA network. 2. Implemented a company PBX with more than 150 extensions, interconnected to the PSTN with personalized scripts for the various dept within the company. 3. Implemented a 15+ call center using a virtual PBX, using open source software, the call center did not have infrastructure, the physical PBX was located at an operator and the agents used mobiles to receive calls, all features were implemented such as queues, welcome message, email sent to agents for missed calls, voicemail, after hour annoucement, etc etc 4. Implementation of different protocols to interconnect with various elements within a telecom network, such as MML interfaces for service provisioning, smpp to provide sms based services, radius/diameter to provide real time charging, etc etc 5. etc

    $16.67 /hr
    0 hours
    0.00
  2. Nick Butcher

    Nick Butcher

    Network Voice Engineer

    United States - Last active: 6 days ago - Tests: 3

    I am an experienced Network Voice Engineer with consulting experience. I have done remote work as well as on site with many different clients. I am strong in Cisco Unified Communications Manager, Unity, Unity Connection, Cisco Unified Presence Server, Cisco Jabber, Cisco Voice Gateways, Cisco CallManager Express, and various phone models. I have a current resume available upon request. I have a current CCNA, CCNA Voice, and I have completed 1 CCNP Voice Exam (CIPT 1).

    $35.00 /hr
    0 hours
    0.00
  3. Tushar Jain

    Tushar Jain

    Voice & Data Consultant

    Australia - Last active: 06/07/2014 - Tests: 3

    Tushar is a seasoned professional with 11+ years of experience in managing network operations in a service provider / NOC environment. Experienced & Skilled in Telecoms, MPLS, BGP, VoIP, SIP, Network Support and Managed Services, Remote Network Monitoring, Networking Services, Carrier Services , Telephony Services, IT Managed Network Services, Remote NOC Support. With an In depth design, implementation and support experience in Integrated network management system, Prepaid billing system, Switching, VOIP & Telephony services, SIP Trunking and many more areas, he brings with him a wide experience and has proven to be of great value to all the organizations and clients he has worked for.

    $22.22 /hr
    0 hours
    0.00
  4. Nuno Torres

    Expert PBX Configuration

    Portugal - Last active: 05/24/2014

    Several years woking with PBX systems: Alcatel Cisco Siemens

    $27.78 /hr
    0 hours
    0.00
  5. Yasir Star

    Yasir Star

    Network/System/PBX Engineer

    Pakistan - Last active: 3 days ago - Tests: 2 - Portfolio: 5

    I am Telecommunication Engineer. I have 04 years and 10 months experience in EPABX, IP Networking, IT, Telecommunication, SDH, IP Telephony, GSM, Optical Fiber Transmission. I also have experience in following areas: Computer Hardware/Software, Online Technical Support, Phone Support. I am Certified Engineer From Cisco and Alcatel-Lucent. I can work with Technical/Non-Technical Challenges. I can provide Online Support for given Task.

    $8.00 /hr
    0 hours
    0.00
  6. Nasir Bhutta

    Nasir Bhutta

    Dr, Programmer, Developer, security engineer

    Pakistan - Last active: 1 month ago - Tests: 3 - Portfolio: 9

    A software programmer with 7 - 8 years of programming in many different languages including c/C++, C#, VB, CB.Net, ASP.Net, Java, Python, Turbo Pascal etc. I have worked on many projects with many different clients from many different countries and in many different areas including Protocols, security products, APIs, Simulations, emulations, Web Development, Management Consultancies, Financial Consultancies, health care etc.

    $50.00 /hr
    0 hours
    0.00
  7. Alexander B

    Alexander B

    Linux/Asterisk/Vicidial expert/API/CRM Developer

    Dominican Republic - Last active: 20 days ago - Tests: 3

    10 years of experience with production unix systems 6 years of experience with VOIP pbx and callcenter solutions. I prefer a custom writting setups but have lot of experience in freepbx based pbx setups like pbx in a flash, elastix, trixbox, asterisknow, vicidial, goautodial). Lot of experience in writting CRM/accounting/billing web applications and voip frontends with PHP and mySQL. As well have done numerous integration project. I am seeking opportunities to build new state of art PBX and CRM systems from the ground up for you or your business.

    $50.00 /hr
    5 hours
    0.00
  8. Muhammad T.

    Muhammad T.

    Netwok/System Engineer

    Pakistan - Last active: 21 days ago - Tests: 18

    With a background in IT support, operations management, configuration, and maintenance of information system, IT Infrastructure, I have 2+ years of international experience working with many companies. Currently I am the Assistant Manager, IT in Ibrama Communication company. Ibrama Communications is one of a biggest outbound call center in Pakistan with 300 seats and complete infrastructure.In this position, I oversee, Network/Systems Management, Troubleshooting client issue, Monitoring Live Windows and Linux based servers as well, Solutions, and Integration. Present Job summary is: Designing & Managing IT (voice / networking) infrastructure for business continuity and development. Designing and managing LAN infrastructure which includes Linux Based Calling servers & Voice communication (using Asterisk, freePBX, Vicidial etc) , Virtualization (using VMware ESXi version 3, 4 & 5), routing and switching (Cisco), internet access and Wi-Fi environment. Designing and maintaining Business Continuity and Management solution Configuring Cisco Switches (Cisco 3750, 3560,3550 series) Monitoring of live Linux based Vicidial/Goautodial outbound and inbound servers Installing new servers, with hands on experience on (Poweredge R710, Poweredge 1950) servers Installing/Configuring proxies server with PPTP protocols on daily basis Configuring TP-Link routers with Wi-Fi communication all over the office building Maintenance and Optimization of servers on daily basis to make the whole voice infrastructure making smoothly working Configuring Microtik Routers Troubleshooting client issue related to servers, internet, system and making the whole network infrastructure secure with the minimum percent of downtime My motivation to identify new growth opportunities, a solution-focused mindset combined with the ability to navigate across departments and business units, and my in-depth IT experience will allow me to contribute instantly to the success of your division. I welcome the opportunity to meet with you to discuss your vision for growth and how my skills would contribute help you achieve your objectives. Thank you for your time and consideration. Sincerely, M Tahir

    $7.00 /hr
    0 hours
    0.00