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...Carrier services billing manual author charles walker division btuk finance address pp tenter house moorfields london ecy th tel fax e mail bt com issue cs section british telecommunications plc page i date version reason for change history draft various documentation sent out to the industry comments numerous amendments prior finalising actual distribution of finalised agreed by first brought up qms standards tibs included updated with capability and sections renumbered ii contents cover iii introduction information in span interconnection isi third party interconnect extension circuits operator service telephony calls system transit via international outgoing authorised overseas systems incoming from handed over freefone lo call premium rate national phone base timeline assistance directory enquiry emergency radiotelephone non avr customer sited data management indirect access entries s number nis books database supply telephone directories licence use free including payphone local f...