Worked on the livekit/python-sdks repository to enhance the reliability and correctness of SIP routing by addressing a critical bug in SIPDispatchRuleUpdate. Focused on backend and API development using Python, the work involved correcting the assignment of trunk_ids so that updates via ListUpdate are now handled accurately when provided. This fix prevents misconfigurations in SIP service configurations and ensures that SIP call routing operates as intended. By resolving this issue, the developer contributed to more robust backend processes and improved the maintainability of SIP-related features, demonstrating attention to detail in backend systems and a strong grasp of Python-based API workflows.