FreePBX WebRTC outgoing call - No busy signal, no hang up signal

Hi all,

I have installed FreePBX last version, and trunk with twilio. I use UCP to call via WebRTC phone. When I call to external number through trunk I listen the same ringtone in case if destination is busy, unreachable or do not answer. I can’t understand if I call correct number or not?
Help me to resolve this problem please.
Thank you.