ByteDance, owner of TikTok and other global platforms, relied on its in-house tool Lark but lacked external telephony, forcing employees to use personal numbers, raising costs and security risks. Seeking a scalable solution, ByteDance deployed Yeastar Phone System for global remote working, enterprise telephony features, and seamless integration with Lark. The system, chosen over Avaya and Cisco, was installed within hours, connecting SIP trunks, IP phones, and gateways. With Linkus Desktop and Mobile Clients, staff gained unified communication, while Yeastar’s open APIs enabled automatic extension assignment in Lark, improving efficiency and supporting future customization.

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