NEC Electra Elite IPK II Features And Specifications Manual page 582

Document Revision 1
23-03-01 Universal Answer/Auto Answer
For each extension, select the route that it will use for Auto-Answer for Non-Ringing Lines. The
routes correspond to the Trunk Group Routing table set in Program 14-06.
Trunk Group Routes: 1~100
Operation
Ringing Trunk or intercom (ICM) call:
Lift the handset or press the Speaker key.

The setting assigned for 15-02-10 and 22-01-01 determines which call is answered first.
2 - 560
Electra Elite IPK II
Line Preference