I have an acd telephone that the customer has a private dn on key 3 and rollover on key 4. Is there a way to set it up so when the customer is not logged in when they pick up the handset they will get dial tone off of key 3 and when key 3 is ringing, set it up so that when they pick up the handset it will answer key 3. I tried putting IRA and OLA in COS but that didn't work. Any ideas or will this even work?