ok i set it up as a speed call to a dn. when i call a number that does not have a mailbox my day greeting comes on, when i press 0 there is a somewhat of a delay, it only rings my operator key once then goes to the operator mailbox. is there any way to get more rings out of it? also how does it determne where the operator mailbox is. i have not configured anything in the 0 mailbox, yet it lights the lamp on the set i want it to. i also have 0 programmed on another set.