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Update:I tried running the same steps with Xcode 11.2 (11B52) and the calls seemed to work on iOS 13.2 & 13.2.2 devices. Previously I was using Xcode 11.0 and iOS 13.1.3.I was able to interrupt both PSTN outbound and PSTN inbound calls with VoIP incoming calls and continue the calls after the interruption without failing the active PSTN calls.By the way I am using the Twilio Voice SDK.-bobie

Hi @maheshvaghela_Thanks for starting the thread, and yes, we are observing the same problem as in your description.Happens only on devices running iOS 13+Tried the same steps using Whatsapp VoIP call and did not fail the PSTN callHappens only when the first call is a PSTN call and PushKit VoIP call as the second oneSteps Make a PSTN outgoing call from the deviceOnce the PSTN call is connected, make a VoIP incoming call to this deviceWhile investigating the issue we saw that the problem seems to only occur on the app built with Xcode11 and running on iOS 13 (the device is on 13.1.3). The PSTN call does not fail in this scenario if the app is built with Xcode 10 (Enterprise distribution version running on the same device). This could be the reason why incoming PushKit pushes in those apps do not cause this problem.I then started looking into the device log in the Console application by plugging by device to the laptop. I noticed a couple of appearences of TUCallDisconnectedReasonComponentCrashed around the time when the call failure happened in the log like this:error 15:02:22.975254 -0700 MobilePhone Disconnecting call with TUCallDisconnectedReasonComponentCrashed:but so far we haven't had any luck figuring out from the context of the log what excatly caused the "crash" and the call to fail.Bobie Chen