I opened for this by avaya a case (case number 12642210)
At the Time MM system does not support using NTP to an external time source.
The current supported configuration is that the MAS(s) synchronise to the MSS using NTP. The MSS uses its internal clock as the time source.
In future releases, you will have the option of setting the MSS to point to an external NTP source, which would then be passed down to the MAS as well.