call completion; call connection
Technical term in computing and telecommunications for the successful establishment of a voice or data call.
If the call connection fails, please try again.
This system takes about three seconds to establish a call connection.
General term for 'connection' (physical, network, etc.). 通話接続 specifically refers to the completion of a voice call.
Means 'telephone call' or 'conversation'. 通話接続 is the technical process of connecting that call.
Compound of 通話 (call, conversation) and 接続 (connection). A straightforward technical term.