Evan Zeng, CCIE No. 4933, joined Cisco in 1998 as a senior project engineer for the Professional Services Team and is currently a design consultant for the Advanced Services Team in China. In this position, Evan's focus is on the design and deployment of new converged data/voice networks that provide telecommunication services using SS7, ISDN, R2, H.323, MGCP, and SIP protocols. During his tenure, Evan designed and installed the world's largest VoIP network for China Unicom.