Mixing VOIP & Cellular calls with carrier WiFi calling causes inability to place Cellular calls
|Product:||iOS + SDK
When T-Mobile's WiFi calling is in use, after receiving simultaneous calls to phone app and our VOIP app and ending one of the calls, attempting to place a call with the system dialer results in call failed.
Steps to Reproduce:
Make sure your carrier's WiFi calling (T-Mobile or Verizon) is being used.
1. Make a dial through call
2. Receive in inbound call to VOIP app (hold and answer)
3. Switch between calls to verify audio on both
4. End the line 1 call.
5. Try to make a outbound call using Line 1.
You should be able to place a call from the system dialer.
Attempting to place a call from the system dialer results in Call Failed.
iOS 10.2 (14C92)
This only happens when the carrier's WiFi calling is active.
iPhone 6, 128GB, T-Mobile with WiFi calling, iOS 10.2 (14C92)
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