Which information from the existing numbering plan that helps you design an effective VoIP dial plan?

You are CCNA VOICE associate in Certkey.com and you want to install a new UC500 solution. Which information from the existing numbering plan that helps you design an effective VoIP dial plan? (Choose all the apply.)

A.
station number

B.
number of digits forwarded by the local CO

C.
direct inward dial ranges

D.
length of internal number extensions