My experience with AT&T was that they were overly bureaucratic but outside of those rules anything goes. For example, they didn't ask for an LOA for BGP announc

My experience with AT&T was that they were overly bureaucratic but outside of those rules anything goes. For example, they didn't ask for an LOA for BGP announcements of other people's IP space. When we were turning up a new Comcast circuit we accidentally leaked Comcast's customer routes (~5000) to AT&T and they were accepted.