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[Synopsis] Waits for an extension to be entered [Description] WaitExten([seconds][|options]): This application waits for the user to enter a new extension for a specified number of seconds. Note that the seconds can be passed with fractions of a second. For example, '1.5' will ask the application to wait for 1.5 seconds. Options: m[(x)] - Provide music on hold to the caller while waiting for an extension. Optionally, specify the class for music on hold within parenthesis.