as soon as a call is started, you are used to hearing a ring back tone (connection tone). on newer Samsung devices, the sound has been partially eliminated or at least deactivated. if you want to hear the ring back tone after dialling, you have to check the phone settings to see if the option is available, as shown here in the instructions.

Android 10 (One UI 2.0)
Step 1:  Open the  Phone-App
Step 2:  Open the  menu
Step 3:  Open the  Settings
Step 4:  Tap on  Call alerts and ringtones
Step 5:  Enable or disable  Play tone when call connects
  1. Open the Phone-App
  2. Open the menu
  3. Open the Settings
  4. Tap on Call alerts and ringtones
  5. Enable or disable Play tone when call connects

Samsung Instructions
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