FrankFei
FrankFei
I also encountered such a problem, if the iOS version is 10, the probability of occurrence is relatively high, about 30-40%, if the iOS version is 11, in the case...
I use linphone(iOS) connect SIP Server,it works fine.
Our company's SIP server is purchased by our company. The hardware supplier has already proved that their hardware is sending out the voice by capturing the packet, but the person...
We use the phone to call and the person who answers is connected to the APP.
Is it necessary to handle hold and unhold in the code? Can you send me your hold and unhold code?
The method of hold and unhold, I added in the answerCall, it seems that there is no effect! 
@mattyleggy Can you refer to the RNCallKit related code? I think I may have a problem with this RNCallKit call. My email: [email protected]
Using this method of yours, I tested it here and now the sound is normal.
 我现在使用以上方法解决了！FYI
Let's test for some time to see if there is any problem, I will tell you again.