Returning call from CallBack is hanged up by MyPBX

We have problem with CallBack functionality in MyPBX-Standars V4 equipped by FW Functional part is this: "MyPBX allows caller A to dial an inbound route number, and after hearing the ring, A can hang up the call, then mPBX will call A with this number." Non-functional part is this: "When A pick up the call, A can dial the number he wants to call; mPBX will call the number with its outbound route." When we pick up the phone, MyPBX just ends a call. There is no prompt, no other action. What we do wrong?


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