Another issue is reliability. We have implemented ENUM years ago in our PBX product but customers are not using it. Carriers don't have a benefit (from user enum) and customers neither. Cause if they are using enum, they never know if their calls go through (not even if they indeed go to the right destination). It might, but it might not. This is a) cause targets enum directs calls to usually are somehow "unsecure" and b) cause enum creates an n to n interop problem. When i pass all my calls to my (SIP or legacy) provider, I have only a 1:1 interop problem. This is what we hear from customers. The picture might change with SIPS/SRTP though. Regards, Christoph -----Ursprüngliche Nachricht----- Money is indeed something which will usually make people think.