See this post from a while back… It will answer your questions completely (remember to follow the link too)
old post Now to answer your question “literal fashion†NO, those are not valid circuit id’s… Those are examples of ckr’s (carrier circuit id’s.)
If you’re contacting at&t (the local Telco) they’re not going to list those as valid circuit id’s.
Now if you’re contact at&t (the long distance company) those listed service codes are what THEY would use.