Does the Yealink WH62 have an external ringer?

Yes, there's a built in ringer in the charging base of the Yealink WH62. When there's an incoming call the charging base will give you an audible alert so if you're away from your desk and don't have your headset on, you'll be able to know there's an incoming call. This feature can be turned on or off in Yealink USB Connect.