Year 2000, Started with Network Engineer.
Year 2001, CCNA, CCNP certified
Year 2002, CCIE Routing & Switching certified
Year 2003, Scenario Network Engineer working on major projects in Telco Data network, Enterprise Voice and Security
Year 2005, Joined Cisco TAC voice teams specialized in voice gateway, CME/CUE, CUBE, DSP and voice protocols, etc.
Year 2006, Voice CCIE certified
Year 2007, Moved to Unified Communication TAC Teams specialized in Callmanager, Presence, CER, Unity/Unity Connection etc.
Year 2008 - 2009, Advance to technical expert in Unified Communication and Unified Communication Apps.
Year 2010, Move to IPCC TAC team to support contact center software.