how to set phone_country_code to null

Hello,

my interface is creating contact points using hz_contact_point_v2pub.create_contact_point api. If owner_table_name = 'HZ_PARTY_SITES', phone country code is populated by phone country code from location country.

Since customer phone number maybe some other country number, the requirement is to set phone_country_code to null.

I have set phone_rec.phone_country_code = fnd_api.g_miss_char, but it does not help.

Country code can be removed in UI.

I would appreciate very much any help on this issue.

Thanks,

Asnate