http://www.sansay.comDeveloped data mining tools supporting MMS by parsing detailed call records (CDR), auto-correlate with database, querying MySQL using calculation statements, and interface via soap/xml for real-time stats from Sansay SBC (VSXi).Developed CDR generator from JSON template, and real-time stats generator using JAX-WS endpoint.Developed several C core libraries: sparse-optimized N-ary trie, auto-ssh / auto-scp using forkpty, time-expiry cache table, etc.Developed SIP NLZ to control QPS for SIP invites within the network license zone (first-come first-serve, burst tolerant, and load-balanced).Responsible for next-generation IDR (Intelligent Dynamic Routing) product high-level design and prototype coding.Developed route-based KPI analysis module in MMS using MyISAM engine over RAM-disk for ultra-fast performance. Drastically reduced memory usage of existing CDR stats collection module.Enhanced NLS system to allow LNP lookup for multiple countries setup.Developed SMC (SIP message converter) for inline manipulation of SIP message header and body. Flexible JSON config for SMC profile, rulesets, conditions, and actions. Syntax for header / body tag matching, macro extensions, user-defined POSIX ERE regular expressions, describing stored variables and logical evaluations & conjunctions, external data file searching, SDP / ISUP / pidf parsing. Fully capable of demanding SIP message filtering and replacement needs.Developed Cloud License Manager enhanced with Network License Zone control and geo-redundancy for large-scale VM deployment.Co-developed host-based media transcoder for various codecs: G.711, G.729, Opus, G.722, G.722.1, DTMF, etc. Added T.38-G.711 fax interworking, FAS US ringback tone detection.Added support for SIP STIR/SHAKEN in VSXi to stop robocalls. Implemented PASSporT signing and verification using ES256 algorithm.Enhanced TLS in VSXi with DHE, ECDHE, and configurable cipher list.

http://www.ericsson.com/ourportfolio/products/ip-edgeStarted in Abatis Systems (Jan 2000): Phase2 routing stack, PPP dial-up, DHCP relay, ARP, MLIS internetworking.* Redback Networks acquired Abatis Systems on August 2000.Redback (Sept 2000): ATM configuration & management software, IPC to SAR controller, RFC1483 multi-encapsulation, RFC2225 ATM-invARP, SNMP MIBs, ITU I.610 OAM, protocol bifurcation, VC tunnels, hierarchical shaping, B-RAS subscriber termination, circuit-creation-on-demand, cross-connect, advanced IP QOS for TR-59 architecture.Redback (March 2006): transferred to IP Infrastructure, Interface & State Manager (core of the distributed fault-tolerant SEOS control plane). Involved in various system features: ATM APS, ethernet redundancy, mobile IP, flow, DoS prevention, inter-chassis redundancy.* Ericsson acquired Redback Networks on Dec 2006.* Transferred from Vancouver, Canada to Taipei, Taiwan on June 2010.

http://www.glenayre.comPromoted to lead and maintain Site Networking (ISDN, PPP, Frame Relay, HDLC, VxWorks Streams driver, Link Manager, Gateway Manager).

http://www.deltacontrols.comWindows VxD & NT TCP/IP tunneling protocol driver (enabling BACnet over IP over Ethernet). Windows SETUPX automated device driver installation.

http://www.phase-technology.comPhase (crystalization) analyzing GUI softwares on both Windows and embedded devices.