Methods, systems, and apparatus include computer programs encoded on a computer-readable storage medium, including a method for providing information. A request is received by a call routing server to establish a call between a client device and a remote telecommunications device. A given transmission criterion that triggered distribution of the particular digital component to the client device is determined by a call context server. A set of contextual information that is mapped to the given transmission criterion is identified, by the call context server, in a data store storing a mapping of transmission criteria to contextual information. The client device is connected, by the call routing server, to the remote telecommunications device using the phone number. The set of contextual information is transmitted to the remote telecommunications device or a computing device that is associated with the remote telecommunications device while the call is being connected or in progress.