What is eab presence provisioned?

EAB/Presence Provisioned - I've read this means voice & data can be used at the same time without LTE. A technology called EAB/presence provisioning allows both calls and data at the same time without volte. You can also switch on or off Cellular Radio Power, VoLTE Provisioned WiFi calling Configured EAB/Presence Provisioned and Cellular. I'm looking at your picture and see EAB/Presence Provisioned with the toggle turned on. First of all, that the voice service must be provisioned as any other IP Service over the LTE data bearer.