WebRTC中指纹问题的可能性

Question

我正在使用适用于iOS的Apprtc演示测试WebRTC实现

我遇到的问题是指纹在我们发送的本地sdp中不匹配。

Failed to set session description. 
Error: Error Domain=RTCSDPError Code=-1 "The operation couldn’t be completed. (RTCSDPError error -1.)" 
UserInfo=0x17466d480 {
    error=Failed to set local answer 
          sdp: Failed to push down transport 
          description: Local fingerprint does not match identity. 
          Expected: sha-1 FB:05:7C:59:1A:57:A2:47:0D:E2:2A:02:D1:C6:21:F9:9B:9A:10:0E 
          Got: sha-1 92:1C:6B:E0:2F:CA:63:49:8C:F4:CC:C2:F4:B9:86:F5:D8:7F:56:CC}

您能否说明这个问题背后的原因或Apprtc中的调试位置