question about phone-call-provider-closed-websocket

call id: 84ab9a30-b071-4d9e-a16c-daff2e640ecd
this call terminated due to phone-call-provider-closed-websocket
what does it mean? does it mean twilio closed the socket or vapi?
i have looked into the log from twilio side, and it's indicating the remote server closed the socket, see the img attached.

So mainly, is there anything we can do to prevent this from happening, other than passively seeing it happen radomly?

Thanks
Screenshot_2024-07-19_at_4.42.01_PM.png
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