Which three fiels require a URL to allow the Cisco IP Phone to work correctly?

You are configuring the Cisco IP Phone in the Cisco Unified Communications Manager for the Cisco TelePresecnce Room without using the Enhanced Phone User Interface (MIDlet). You must enter the URL information for the codec in the External Data Locations Information section. Which three fiels require a URL to allow the Cisco IP Phone to work correctly?(Choose three.)

A.
Information

B.
Directory

C.
Message

D.
Services

E.
Authentication Server

F.
Proxy Server

G.
Idele