David Werdiger discusses telco billing systems, and how difficult they are to get right.

“Yes, telco billing systems are one of those things that you don’t notice … until something goes wrong! Telco billing is hard. Damn hard. All those CDRs, all those rate plans, all that processing. On the billing scale of complexity, telco is right up the top. We run billing environments with some of the wildest schemes anyone could think of, all in the name of acquiring and keeping customers. Come to think of it, we have probably contributed to this by helping our partners design these very plans.”  [Billing Bureau]