I configure AutoAttendant through call router and call handler in unity ,but the caller number can't display and it prompts "From Voicemail" on phone before the call is picked up.And after picking up it,the caller number is display normally . Why ?
Assuming that you've set up the call transfer to be 'supervised transfer' this is the behavior you're going to see. When Unity puts the original caller on hold in order to call your phone, the two call legs aren't bridged together, so the call appears to CallManager to be a simple call from Unity. When you pick up the call, then Unity bridges the two legs together, and CallManager changes the caller ID to reflect the change. If you reconfigure Unity to use 'release to switch' then you will see half a second of the call being from Unity, but when it bridges the two legs together (while your phone is still ringing), CallManager will immediately change the readout.
When you choose 'release to switch', Unity will put the caller on hold, dial the user's number, and connect the two. So, the caller should hear a very brief moment of music on hold, then hear the ringback from the phone, etc. To get it so that there's MoH until the recipient answers, you'd have to go back to 'supervised transfer', which would break your Caller ID.
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