Visual Logic : Develop and Maintain the Visual Script for Robot Control.API : Develop and Maintain the API for Robot Control.Custom Data : Develop the dynamic structure data.Annotation Tool : Modify the open source for a graphical image annotation tool.

Asterisk : Building, Develop and Maintain the Asterisk Server with Docker.Kamailio : Building, Develop and Maintain the kamailio Server with Docker.AWS : Maintain Asterisk Server on EC2 of AWS.WebRTC : Build the WebRTP Server for Web Phone.Web Phone : Develop the prototype web phone with the web browser.

ARS Phone Reception Center : Developing ARS Call Reception Center with Google Cloud PlatformServer Monitoring : Build the Zabbix System for ServersVoice Call : Developed the Voice Call API for Windows System.Asterisk : Maintain the Asterisk Server.Opensips : Build the Opensips Server.Enterprise Server System : Build the Enterprise Server System for Voice Call.Monitoring System : Build the Monitoring System for Servers with SMS.WebRTC : Build the WebRTP Server for… Show more ARS Phone Reception Center : Developing ARS Call Reception Center with Google Cloud PlatformServer Monitoring : Build the Zabbix System for ServersVoice Call : Developed the Voice Call API for Windows System.Asterisk : Maintain the Asterisk Server.Opensips : Build the Opensips Server.Enterprise Server System : Build the Enterprise Server System for Voice Call.Monitoring System : Build the Monitoring System for Servers with SMS.WebRTC : Build the WebRTP Server for Voice Call.High Availability : Developed the HA System for the SIP Proxy Server. Show less

Framework : Developed the framework library. SIP Proxy Server : Developed the SIP Proxy Server.Android Video Call : Developed the GUI and the SIP Stack for Android System.High Availability : Developed the HA System for the SIP Proxy Server.Push to Talk : Consulted the SIP PTT System.

Team LeaderSIP Stack : Maintain the osip and xosip for Embedded Device.Real Time Chat : Developed the SIP Real Time Chat.QT GUI : Maintain the GUI of the Video Call in the Embedded Linux.Android Video Call : Maintain the native c code for Android System.Device Driver : Maintain the device driver for the Embedded Linux.

ManagerCSTA over the SIP Programmer: Developed CSTA (Computer-Supported Telecommunications Applications) over SIP to control the IP hardware phone and to notify someone's status to the subscriber in SSW (Soft Switch).Diameter Stack for CDR (Charging Data Records) Programmer: Developed a Diameter Stack and Diameter Stack APIs for the offline CDR in IMS (IP Multimedia Subsystem).Presence Service Programmer: Developed a service block to notify someone's status to the subscriber via the… Show more ManagerCSTA over the SIP Programmer: Developed CSTA (Computer-Supported Telecommunications Applications) over SIP to control the IP hardware phone and to notify someone's status to the subscriber in SSW (Soft Switch).Diameter Stack for CDR (Charging Data Records) Programmer: Developed a Diameter Stack and Diameter Stack APIs for the offline CDR in IMS (IP Multimedia Subsystem).Presence Service Programmer: Developed a service block to notify someone's status to the subscriber via the PIDF (Presence Information Data Format) over SIP.NAPTR (Naming Authority Pointer) DNS Client Programmer: Developed the Making and Parsing module of NAPTR for a SSW to search the vendor's network. Show less

Assistant ManagerLG Telecom Video Phone Assistant Manager and Programmer: Supervised a team of 10 people; and, designed and developed the SIP server for the Video Mail and the Call Transfer Services.MSRP(Message Session Relay Protocol) Stack Programmer: Developed a MSRP Stack layer as a protocol for transferring messages to client's softwares.Proxy-CSCF(Call Session Control Function) Programmer: Designed and developed blocks related to the call processing, IPSec(IP Security) and… Show more Assistant ManagerLG Telecom Video Phone Assistant Manager and Programmer: Supervised a team of 10 people; and, designed and developed the SIP server for the Video Mail and the Call Transfer Services.MSRP(Message Session Relay Protocol) Stack Programmer: Developed a MSRP Stack layer as a protocol for transferring messages to client's softwares.Proxy-CSCF(Call Session Control Function) Programmer: Designed and developed blocks related to the call processing, IPSec(IP Security) and PDF(Policy Decision Function) linkage functions. Junior ReacherPush-To-Talk Programmer: Developed the interface blocks to link the PTT(Push-To-Talk) server and the media server so that SIP-based terminals can function as radios in the Mobile network.SIGComp Compiler Programmer: Developed a SIGComp compiler to make the program code of SIGComp to the Binary code for use in the SIGComp Virtual Machine.SIP Conformance Tool Programmer: Developed a program (TAO SIP : Test & Analysis On SIP) to verify the SIP protocol. Show less