You have placed all DNs in the Phones partition. During testing you discover that you cannot place calls between IP phones, but you can place calls to the PSTN and voice mail. What is one possible cause of this issue?
A.
A database replication issue is preventing calls between phones.
B.
An access list is blocking RTP streams in your voice VLAN.
C.
An access list is blocking SCCP packets in your voice VLAN.
D.
The IP phones have not been assigned a CSS.