An outbound call is in progress through a Cisco Unified Border Element using G729r8 codec. And it is dropped after 60 minutes. Root cause analysis revealed that ITSP signaled a codec change to G711u. Which two Cisco Unified Border Element configuration changes will prevent this problem from happening again? (Choose two) 

Answer options:

A. Configure the voice-class sip midcall-signaling block command on the outbound dial peer.
B. Configure the midcall-signaling preserve-codec under voice service voip.
C. Configure the voice class-codec command with G711u and G729r8 codecs on the outbound dial peer.
D. Configure the voice-class sip midcall-signaling preserve-codec command on the outbound 247dial peer.
E. Configure the midcall-signaling preserve-codec command under each outbound ITSP dial peer.
F. Configure the midcall-signaling passthru media-change command under voice service voip.

BD