Numbers with this prefix were first introduced in 1999.While 8564371900 was originally issued with the info above, the owner of the phone number (856) 437-1900 may have transferred it through a process called porting.
Caller name: Sterling Medical Supplies
Caller type: Appointment Reminder
It's from Sterling Medical Supplies. You probably have an account with them or ordered something in the past. They are calling to remind you to order more. They are legitimate, their phone system just leaves a great deal to be desired.