A Cisco SX20 is registered to Cisco Unified Communications Manager. It cannot place calls. It is configured with SIP URI 1007 and when traces are run, SIP Forbidden and Unknown calling DN errors are found. Which statement describes the problem?
A. The wrong network IP address is assigned to device.
B. The ACL is blocking port 5060 from device.
C. H.323 is not configured correctly.
D. SIP URI does not contain IP address or hostname.
