It depends how you have it set up. It looks like you have blind transfers set up in the Call Director so they would need to go to a speed call on your MCD that makes the external call.
Conversely you could set up an Alternate Transfer in the Call Director with the Dial String S+[Number]+H and it should work too. Keep in mind to follow ARS routing like the Call Director is dialing the call from a phone. If you need to hit "9" for an outside line it would look like S+9[Number]+H. S is like pressing the switch hook and H puts the call on hold while it waits for an answer. If there is no answer the Alternate Transfer can have a timeout destination in the call flow.