In this paper the ECC recommends that:
• A country should refuse the assignment of E.164 numbers belonging to its numbering plan to be used outside of its territory on a permanent basis.
• A country should not allow the use of E.164 numbers belonging to another country’s numbering plan in its territory on a permanent basis.
• Extra-territorial use of numbers should only be permitted in exceptional cases which have been defined by an ECC Decision. Possible candidates are some nomadic voice services and some M2M services.