Not able to update Contact Person Email ID using IDocs (from MDM --> ECC)

Hi Experts

Please let me know the field(s) used to update Contact Person Email ID and Fax.

I'm not able to find the same in the provided Idoc (DEBMAS, ADRMAS).

Note: Using the provided IDoc I'm able to update -

Contact Person - First Name, Last Name, Telephone, Dept., Function of Contact Person.

Regards