unless the call is ddi (did), in your route, auto will = yes, then on the trunks, you will have a atdn.. the number all inbound calls route to for that trunk..
with ddi, your provider sends digits.. usually match your dn's.. stateside, my telco sends 4 digits to a route, the next vacant trunk, then sends those four digits inbound, my switch sees that as any other 4 digit call..
inbound target to the trunk or route is a function of the far end.. we do routing depending on trunk type and signal arrangement..
john poole
bellsouth business
columbia,sc