A method for determining a status of a presentity by determining a success rate for a plurality of transactions of the same transaction type that are initiated by at least one entity in a first computer network-based communications system in a plurality of corresponding transaction requests, where the transactions relate to a presentity, identifying a status descriptor that has a predefined association with the transaction type, identifying a condition that has a predefined association with the status descriptor and the transaction type, and associating the status descriptor with the presentity if the success rate meets the condition.