Method for converting a number form in a local number plan to form a number as a global number plan

A method of converting between two terminal equipments, a local dialed number according to a local dial plan to an overall number formed in a global numbering scheme, one of the terminal equipment being connected to an endpoint identified by a local number from local numbering plan, including the following steps: - receiving from a network device, a conversion request in connection with a multimedia session, including local number and address of location of a conversion rule a local number format to an overall number for this local numbering plan; - obtaining from a localized equipment to the location address of the conversion rule; - conversion of local number to a global issue with the conversion rule; - sending the overall number to the network equipment responsible for the conversion request.