Intelligent Caller ID selects which of your numbers to display based on a combination of factors, including:

• Answer rate - how often calls from a given number are answered
• Previous call count - how many times that number has already been used to call the same destination
• Call duration - the typical length of calls placed with that number
• Call volume - how many calls are being placed with that number overall
• Matching digits - how many digits of the calling number match the destination number

These factors are weighed together to choose the caller ID most likely to be answered for a given outbound call.