When configuring a video ISDN gateway, which two actions are requirements for the Cisco Preferred Architecture for Enterprise Collaboration?

A.	Use SIP instead of H.323.
B.	Perform dial string manipulation on Cisco Unified Communications Manager.
C.	Use an * (asterisk) at the end of each ISDN number, as a suffix.
D.	Use an ! (exclamation point) at the end of each ISDN number, as a suffix.
E.	Use H.323 instead of SIP.