Good evening,
we have a simple configuration with a qx-50 where a sip phone registered on the pbx is calling an external device connected to an fxo.

What seems wrong to me is that the sip phone result in connected state during the ringing of the call and not when the connected device pick-up.

Because the sip phone is registered on an alarm system, this result in a serious problem because the alarm prompt is already played when the call is answered on the other end.

Does anyone know which parameters can affect this behavior and allow to handle the call in a normal way (fxo phone ringing and sip phone connected after answer)?

Many thanks.