----------------------------- **While I generate an answer, here are some sources that might be helpful**: * [Call Ended Reason]() * [Create Phone Call]() * [List Calls]() * [Get Call]() -----------------------------

### Answer The issue of calls abruptly ending with the error "phone-call-provider-closed-websocket" typically occurs when the connection with the call provider unexpectedly closes. This could be due to network issues, timeouts, or misconfigurations between the voice service and Vapi's servers. To resolve this issue, you might want to check the following: 1. Ensure that the network connections are stable and robust at the time of the calls. 2. Review any timeout settings or configurations that may cause the websocket to close prematurely. 3. Check for any updates or outages from your voice service provider that might be affecting connectivity. It's important to collaborate with your voice service provider to investigate this issue further, as they might provide more specific insights based on the network data and configurations used during the calls.

Got it. Tagging @User for additional help.