CCITT Recommendation E.230 Telephone network and ISDN. Operation, numbering, routing and mobile service. Chargeable duration of calls

ITU-T Recommendation E.220 Telephone network and ISDN. Operation, numbering, routing and mobile service. Interconnection of public land mobile networks (PLMN) ITU-T Recommendation E.218 Series E: Overall network operation, telephone service, service operation and human factors… Maritime mobile service and public land mobile service. Management of the allocation of terrestrial trunk radio Mobile Country Codes ITU-T Recommendation E.217 Series E: Overall network operation, telephone service, service operation and human factors. International operation - Maritime mobile service and public land mobile service. Maritime communications – Ship station identity ITU-T Recommendation E.232 Telephone network and ISDN. Operation, numbering, routing and mobile service. Charging for calls to subscriber’s station connected either to the absent subscriber’s service or to a device substituting a subscriber in his absence ITU-T Recommendation E.260 Telephone network and ISDN. Operation, numbering, routing and mobile service. Basic technical problems concerning the measurement and recording of call durations ITU-T Recommendation E.261 Telephone network and ISDN. Operation, numbering, routing and mobile service. Devices for measuring and recording call durations