A system capable of connecting a device to a Public Switched Telephone Network (PSTN) using an adapter. During a telephone call using the PSTN, the adapter may receive an incoming call from the PSTN and send caller identification to remote server(s). The remote server(s) may determine an identity of a first user currently on the telephone call and determine that the incoming call is directed to a second user. Based on the caller identification, the remote server(s) may send a notification to the second user indicating the incoming call. Alternatively, the remote server(s) may interrupt the current telephone call to announce the incoming call. For example, if a parent is on the telephone when an incoming call for a child is received, the remote server(s) may send a text message to the child without interrupting the current telephone call.