Seven Du
CEO Founder at 北京信悦通科技有限公司(Beijing XinYueTong Technology)
Yantai, Shandong, United States
Summary
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Rockstar🎓
Top SchoolSeven Du is a seasoned telecommunications software leader and founder with 17 years building VoIP and real-time communication systems. He co-founded Beijing XinYueTong in 2011 and now serves as CEO of Yantai Xiaoyingtao, blending executive leadership with hands-on engineering. Deeply technical, he contributes to prominent open-source SIP projects such as Kamailio and Sofia-SIP, where his work on NATS integration, SIP robustness, and cross-platform fixes improved system stability and interoperability. His background spans core architecture and operations roles at Eleutian, Idapted, and China Netcom, giving him rare end-to-end visibility from carrier-grade systems to startup productization. Trained in Physics, Electronics & Information at Yantai University, he brings a hardware-aware systems perspective to software design. Notably, he pairs product leadership with active low-level protocol development—an uncommon mix that accelerates reliable real-time communications deployment.
17 years of coding experience
11 years of employment as a software developer
Bacholor, Physics, Electronics & Information, Bacholor, Physics, Electronics & Information at Yantai University
Stackoverflow
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0reached
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Github Skills (17)
kamailio10
nat10
telephony10
c1110
voip10
sip10
c1710
sips10
natsio10
networking9
websocket9
websockets-client9
client-websocket9
websocket-client9
macos8
Programming languages (18)
Github contributions (5)
freeswitch/sofia-sip
Oct 2012 - Aug 2021
Sofia-SIP is an open-source SIP User-Agent library, compliant with the IETF RFC3261 specification.
Role in this project:
Back-end Developer
Back-end DeveloperContributions:8 commits, 4 PRs, 8 comments in 9 years
Contributions summary:Seven primarily contributed to bug fixes and code enhancements within the Sofia-SIP library. Their work focused on addressing issues related to platform-specific build problems on macOS, resolving compile errors, and fixing WebSocket write failures. They also added support for RFC3556 (RR and RS) and addressed compiler warnings. The changes indicate a focus on improving the robustness and cross-platform compatibility of the SIP user-agent library.
agentkamailiocompliantspecificationfreeswitch
kamailio/kamailio
May 2019 - Jun 2022
Kamailio - The Open Source SIP Server for large VoIP and real-time communication platforms -
Role in this project:Back-end Developer
Back-end DeveloperContributions:1 review, 8 commits, 5 PRs in 3 years 2 months
Contributions summary:Seven primarily focused on enhancing the NATS module within the Kamailio SIP server. Their contributions included fixing a bug related to the NATS `connected` event route, adding a KEMI publish function, and integrating a reply parameter for publish requests. They also addressed timer-related issues and improved logging for debugging purposes, indicating a focus on system stability and functionality within the context of SIP and real-time communication.
voltesip-serverkamailiofreeswitchchat
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