Abstract: Short message system (SMS-MO) comprising switching arrangements (MSC) and servers (SMSC) at which the messages arrive in the form of messages “destined for a mobile” (SMS-MT). The sending mobile (SMS-MO) includes in the message the address of the server (SMSC) of its card (SIM). The system comprises a virtual server (SMSC-V) which is defined by its address (ADR-V) and is associated with an operator, a real server (SMSC-R) which is defined by its address (ADR-R), the address (ADR-V) of the virtual server (SMSC-V) being the only server address recorded on the operator's cards (SIM), the switching arrangement (MSC) contains an address translator for replacing the address of the virtual server (SMSC-V) with that of the real server (SMSC-R) to which the message (SMS-MO) will be routed, which real server handles the message and routes it to the intended receiver (MO?).

Abstract: Implementation of the sending of short messages to mobile networks with mobile number portability in the same country comprising a computer with SS7 connections able to interrogate all the HLRs of the country where MNP is implemented, being located in an other country or the same. The computer includes a memory cache for all the subscribers of the country which allow to know which HLR to interrogate without searching one they have been found. The memory cache is initially empty and builds once by search of the HLRs when a subscriber does not exist yet in the cache, or when he is ported-out, that is, change its network.

Abstract: A system for a GSM mobile telephone belonging to the network of an operator of mobiles for an intended recipient of a short message (other network of mobiles). The short message (SMS) is composed of a routing envelope with a first field (number of, the calling mobile), ct second field (number of the first short message transmission centre (SMSC) of the network of the calling mobile), a third field (number of the called mobile), as well as a field reserved for the text of the message. A numbering plan (PN) contains the numbers of the short message transmission centres and the possible interconnections between the different transmission centres (SMSC) and the switching contains (MSC) of the networks of the called parties (M1a, . . . M4a). A numbering plan manager (GPN) defines the relay transmission center or centres (SMSC) in order to reach the switching center (MSC) visited by the called party.