Abstract: This invention relates to maintaining a customer database in a computer telephony integrated (CTI) database. In particular it relates to populating and maintaining a customer database in a computer telephony system with shared and unique telephone numbers. There is described a method, apparatus and a computer program product relating to the processing records in a telephony database. The telephony system receives an ANI number along with an incoming call and uses that number to identify records, if any, in the customer database having telephone numbers that match the ANI number. A new record is created in the database if no record from the identified records corresponds to the incoming telephone call and the new record includes a telephone number field containing the ANI number. If one or more records were identified in the database the telephone number in the new record is associated with a shared status.