noun
person-to-person call; personal call
A telephone call where the caller specifies the person they want to speak to, and charges apply only when that person answers. Common in older telephone systems and formal contexts.
国際電話をかけるとき、指名通話にすると相手が出るまで料金がかからない。
When making an international call, if you use a person-to-person call, you won't be charged until the other party answers.
A collect call (reverse charge), where the receiver pays. 指名通話 is a person-to-person call where the caller specifies the person and pays only when connected.
Compound of 指名 (designation, naming) and 通話 (telephone call). The term reflects the practice of designating a specific person to answer the call.