It should in principle be possible for any subscriber of the international telephone network or ISDN to call any subscriber of a public land mobile network.
ITU-T E.213-1993 Referenced Document
ITU-T E.160 Definitions relating to national and international numbering plans*, 2007-01-01 Update
ITU-T E.163 Numbering Plan for the International Telephone Service - Telephone Network and ISDN - Operation@ Numbering@ Routing and Mobile Service (Study Group II) 8 pp
ITU-T E.164 The international public telecommunication numbering plan (Study Group 2)*, 2024-04-19 Update
ITU-T E.212 The international identification plan for public networks and subscriptions (Study Group 2)*, 2016-09-01 Update
ITU-T E.213 Telephone and ISDN Numbering Plan for Land Mobile Stations in Public Land Mobile Networks (PLMN)
ITU-T E.213-1993 history
1993ITU-T E.213-1993 Telephone and ISDN Numbering Plan for Land Mobile Stations in Public Land Mobile Networks (PLMN)
1988ITU-T E.213-1988 Telephone and ISDN Numbering Plan for Land Mobile Stations in Public Land Mobile Networks (PLMN) - Telephone Network and ISDN - Operation, Numbering, Routing and Mobile Service (Study Group II) 2 pp