As talked via phone incase call transfer back to Operator console will happen when the extension not set ‘’call forward no answer’’ to another extension during recall to operator console destination extension will keep ringing it’s normally use.
If the extension have set call forward no answer to another extension call will not transfer back to Operator console.
User manual of NEC Desk Console please find in attached file.
Page No.15-16 will expand how to answer console recall.