the phone was ringing
Телефон звонил, но никто не ответил.
The phone rang, but no one answered.
Телефон звонил, но не было никого, чтобы ответить.
The phone was ringing, but there was no one to answer it.
Телефон звонил, пока я принимал душ.
The phone rang while I was taking a shower.