A method and apparatus are provided for identifying In-Call capability features. The method includes sending, by a Mobile Originated (MO), a call request message to a Mobile Terminated (MT), wherein the call request message comprises information regarding In-Call capability features of the MO; receiving, by the MO, a call response message from the MT, wherein the call response message comprises information regarding In-Call capability features of the MT; and performing, by the MO, In-Call capability negotiation with the MT.