The Hold feature allows you to play music to other person during the call for the purpose to put your call on hold.
How to put a call on hold
If you click 
, you can put the call on hold.
If you click , you can put the call on hold.
How to stop being on hold
If you click 
, you will return to your current call.
If you click , you will return to your current call.
NOTE
- To learn how to change hold music, see Change hold music.