有没有开源的替代方案可以替代 Cloudcall 或 JustCall？
我正在寻找基于VoIP的Justcall或CloudCall的替代方案。这些是以VoIP为基础的云呼叫系统。
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I am trying to find out the alternative for Justcall or CloudCall based on VoIP
These are the cloud based calling system that uses VoIP as their foundation