When the device, that sent the DP2P Request, receives the DP2P Invite, it transforms it into DP2P Confirm just by modifying the header and sends it back to the [N] using _TX_STD without _STDL mode. When [N] receives DP2P Confirm with the same random data as DP2P Invite, it can then safely execute the DPA Request and then reply with DPA DP2P Response at the end of its timeslot.
typedef struct
{
uns8 Header[3]; // 0x000003
uns8 NADR;
uns8 Rand[12];
} STRUCTATTR TDP2Confirm;