TX FollowUp packet must not have FLAG_TWO_STEP set, and it must have FLAG_PTP_TIMESCALE set
Sync message is required to contain the header (See Clause 11.4.2) followed by 10 reserved octets set to zero, see Table 11-8
Pdelay_Req message is required to contain the header (See Clause 11.4.2) followed by 20 reserved octets set to zero.
TX announce packet must have reserved fields set to 0 instead of being set to the current RTC time. See Table 10-7.