how to add ringtone field to one contact record? | developer.brewmp.com how to add ringtone field to one contact record? | developer.brewmp.com

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how to add ringtone field to one contact record?

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how to add ringtone field to one contact record?

i have added fist name field; last name field ;cell phone field;work field successfully,but when i use the similar method to add ringtone field(field name is "pim_EFSDBDevice_FieldID_RingTone"),after then ,pim_IContacts_AddRecord() rerurn 1.what is special notes for add ringtong?