Desktop app RB user A in conversation via voip with other desktop app RB user B.
When a incoming call ( ISDN ) on the PABX to the REX ( WEBRTC ) of RB A arrives it sounds as if RB A is free. No indication of the second call in the RB app nor a busy tone for the public caller.
How can the system be configured so the public caller receives a busy tone.
Remark: when the RB to RB conversation ends while the public caller is still receiving the ring back the call isn't presented on the RB client.
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