No busy tone on VOIPo

[VOIPoBrandon]

My child just reported similar symptoms. I think it's the call at 19:02 EDT in my call logs if that'll help.

I took a look at the call from that time, it does look like PSTN responding with 183 Session Progress, i.e. Ringing/Ringback followed by a 200 OK (call answered). What was the report, just complete silence on the call or, how would you best describe it, thanks!
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Maryjane