During November 2024, Dmitry Zenichev focused on backend development for the kamailio/kamailio repository, addressing a critical bug in NG message handling. He implemented a fix in C that ensures correct to-tag usage when rtpp-flags are present, aligning the parsing logic with the rtpengine-driven processing path. This adjustment resolved inconsistencies in message routing across modules and operation types, improving stability and correctness in network protocol handling. Dmitry prepared the patch for review and integration testing, demonstrating careful debugging and attention to code quality. His work reflects depth in C programming and a strong understanding of backend systems and network protocols.