auto-answer
/ˌɔːtəʊˈɑːnsə/ /ˌɔːtəʊˈansə/Telecommunications and Computing
noun
A facility by which a telephone, modem, or other device, on receiving an incoming signal, automatically establishes a connection with the source and sends a response.
Origin
1960s; earliest use found in Automatic Electric Technical Journal. From auto- + answer.