TestKing has a PBX at corporate HQ and one at a branch office. You to replace the PBX-to-PXB TDM trunk connection with IP connectivity. The PBXs use proprietary signalling method.
The following is a partial configuration of the HQ router that connect to the PBX:
controller t1 1/0 ds0-group 1 timeslots 1-24 type ext-sig dial-peer voice 1 voip
destination-pattern 1001 session target ipv4:10.10.0.1 dial-peer voice 2 pots destination-pattern 2001 port 1/0:1 connection trunk 1001
Which command is missing from the above configuration?

A.
transparent-ccsin the voice port configuration

B.
signal wink-start in the controller t1 configuration

C.
auto-cut-through in the pots dial peer configuration

D.
codec clear-channel in the voip dial peer configuration