这里的 FaceTime，准确说是 FaceTime Video Session Protocol 的能力复用 。 苹果的 FaceTime 协议栈（尤其是其底层的 SRTP 加密、NAT 穿透机制、低延迟音视频编解码协商逻辑）经过多年大规模商用验证，在弱网、多层NAT、防火墙严格限制的环境下，依然能稳定建立端到端媒体通道。

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