SIP Methods ■REGISTER For registering contact information ■INVITE,ACK,CANCEL For session establishment ■BYE For session termination OPTIONS For determining the capabilities of a SIP UASIP Methods ◼ REGISTER For registering contact information ◼ INVITE,ACK,CANCEL For session establishment ◼ BYE For session termination ◼ OPTIONS For determining the capabilities of a SIP UA