Refer to the exhibit.
An engineer is troubleshooting an issue where inbound calls to Cisco UCM with early media fail to establish. While investigating the issue, the engineer finds that Cisco UCM is set to require a PRACK. but the Cisco Unified Border Element is not sending it.
Which command is causing this issue?
A . voice-class sip rel1xx disable
B . voice-class sip early-media update block
C . voice-class midcall-signaling block
D . voice-class sip conn-reuse