Focus on the pronunciation of ring (sb) back
English definition of “ring (sb) back”
ring (sb) back — phrasal verb with ring
/rɪŋ/ verb (rang, rung)
› [I or T] COMMUNICATIONS to call someone again on the phone especially after they have called you or after you called them previously but they were not available: Do you want me to ring you back later? We're advising all our customers to ring back in half an hour.