Je was op zoek naar: 接电话中 (Chinees (Vereenvoudigd) - Engels)

接电话中
on the phone

之后，他接到了y先生打来的至少一次电话，电话中他们讨论了他的诉讼问题。
afer that, he received at least one telephone call from mr. y, during which his proceedings were discussed.