There is a way to configure this using CLI (not supported in CCA). Configure the speed-dial with phone number. Create an outgoing pots dial-peer with specific match (destination-pattern = cell phone #). Then use the prefix command in the following format:
prefix 14085551111,,123
where, "1" is the longdistance code, "4085551111" is the cell phone number, "," will insert the pauses that you are looking for and "123" is the password.
HTH,
Saurabh