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The Extension to Cellular Service (also known as EC500) adds flexibility and convenience for customers on the move. The service allows Johns Hopkins customers with Avaya telephones to have incoming calls to their desk phones ring on both their office phone and one outside phone (typically a cellular phone). When a call comes into your Hopkins extension with EC500 enabled, the caller ID information of the caller will still appear on your cell phone.  This is an add-on feature with an additional monthly charge. You can e-mail SON-CampusOperations to get either of these features have this feature enabled or complete the Telephone Service Request yourself.