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Carlie  Lin

309 Pataula Lane                                                                                                                  (972)522-8746

Plano, TX, 75001                                                                                                      Carlie.Lin@gmail.com

SUMMARY

Software engineer with experience in designing, implementing, testing and maintaining telecommunication products. C/C++ and Assembly programming skills for embedded and application software on telephony cards and Windows platforms. Solve network problems in VOIP environment while connecting company’s products to several vendors’ SIP gateways.

·        Real Time Operating System

·        Multi-Threaded programming

Hardware Background

 

TECHNICAL SKILLS

Languages: C/C++, C#, Java, Assembly, SQL, XML

Application Software: Visual Studio , Code Composer, Dialogic HMP/SR6.0, SIPp, Eclipse, PartySip, OpenVPN, FreeSwitch, WireShark, ClearCase, Maven, Tomcat, Matlab, SQL Server

Protocols: VoIP, SIP, SDP, RTP/SRTP, TLS, TCP/UDP/IP, T1/E1, FoIP

Operating Systems: Windows, Linux, Vxworks, DSP/BIOS

PROFESSIONAL EXPERIENCE

Convergys/Intervoice, Dallas, Texas                                                                       02/1997 – 03/2012

Provides voice solutions to enterprises and network service providers internationally. Offers contact center products, voice portal, hosted solutions and carrier products.

Staff Software Engineer                                                                                             09/2006 – 03/2012

·        Designed and developed C++ modules to add new features for Media Server on Dialogic HMP and DM3 hardware, including FAX, Conference, TLS and SRTP protocols.

·        Delivered customers’ requests to implement additional SIP capabilities for Media Server, including OPTIONS, NOTIFY, PRACK, INFO, re-INVITE, SDP, MIME messages and multiple proxies support.

·        Solved issues on company’s first VOIP IVR implementation and accomplished SIP interoperability certifications on Media Server for Avaya, AT&T, Cisco and Nortel gateways.

·        Implemented SIPp scripts to test SIP capabilities on Media Server to comply RFC standards and to do load tests on FreeSwitch platform.

·        Created RPM packages for FreeSwitch and Sangoma drivers and modified installation wrapper scripts of Media Server to facilitate installation on Linux systems.

·        Troubleshot customers’ issues for Media Server, including C++ modules on resources control, media management, network interface and hardware abstraction layer.

·        Developed Java codes and Lua scripts to do SIP to PSTN call transfer on FreeSwitch platform with Sangoma A108 digital telephony card.

Carlie  Lin                                                                                                                                         PAGE 2

Embedded Software Engineer                                                                                 02/1997 – 09/2006

·        Reduced packets transmit/receive time for VOIP system by modifying C codes on RTP protocol and changing Vxwork’s Ethernet protocol.

·        Designed and implemented C codes for new Telephony card on PowerQuicc II processor to interface with multiple C5420 DSP microchips and to control QuadFALC T1/E1/J1 framer and line interface microchip.

·        Designed and developed C and Assembly codes on C5420 DSP microchips to do ADPCM, DTMF tone detector, serial port, direct memory access, voice buffer management and command/event interface for new card.

·        Managed over 50 countries’ DSP32C Assembly codes and troubleshot customers’ issues on chip control, tone detection/generation, speech detection and voice buffer management.

·        Implemented command/event interface between DSP32C microchip and CL-MD34XX modem chipsets to replace software modem.

Signalogic, Dallas, Texas                                                                                                                            

 

Digital Signal Processing Software Engineer                                                       06/1996 – 02/1997

·        Modified DSPower-Block Diagram software to enhance and correct DSP functions, including FFT, digital filters, convolution, correlation and difference equations.

·        Reduced calculating time by implementing DSP functions like FFT, convolution, FIR filter, IIR filter and transfer functions on ADSP-2061x microchips in Assembly codes.

 

 

Industrial Technology Research Institute, Hsinchu, Taiwan

                                                                                                                                                                          

Assistant Engineer                                                                                                     06/1994 – 06/1995

·        Researched pulse detection and synchronizer microchips to provide recommendations on circuit design in Magneto-Optic Disk driver and evaluated circuit performance with digital analyzer.

EDUCATION

Master of Science in Computer Science, University of Texas at Dallas, Richardson, Texas

Master of Science in Electrical Engineering, University of Texas at Dallas, Richardson, Texas

 

Bachelor of Science in Electrical Engineering, National Tsing Hua University, Hsinchu, Taiwan

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