A mobile station international ISDN number (MSISDN) is a number dialed by a subscriber to call an MS within the PLMN. The function of an MSISDN is equivalent to that of a PSTN number. MSISDNs are encoded in E.164 format, stored in the HLR and VLR, and used for addressing of the MAP interface.
A typical MSISDN example is 861394770001.
Both operations SendRoutingInfo and SendIMSI use MSISDNs for addressing.
- A country code (CC) specifies the code of the country where an MSC is located according to the international PSTN numbering plan. CCs are allocated uniformly worldwide by the International Telecommunication Union - Telecommunication Standardization Sector (ITU-T). Its maximum length is three digits. For example, the CC of China is 86, and the CC of the Great Britain is 44.
- A national destination code (NDC), also called a mobile service access code, is a PLMN number. Its maximum length is three digits. NDCs are allocated uniformly within a country by the telecom management department.
- A subscriber number (SN) is a number of an MS in a PLMN. SNs are allocated uniformly by a carrier in a PLMN. The coding format of an SN is H0H1H2ABCD or H0H1H2H3ABCD. For example, China Mobile uses the coding format H0H1H2H3ABCD for SNs, in which H0H1H2H3stands for the HLR number of the local mobile network, and ABCD stands for the number of an MS.
A typical MSISDN example is 861394770001.
Both operations SendRoutingInfo and SendIMSI use MSISDNs for addressing.
MSRN Number
When an MS is called, a mobile station roaming number (MSRN) is temporarily allocated by a currently-visited VLR to the MS, so that the VMSC or GMSC at the caller side can route the call to the MSC/VLR to which the MS registers at present. This MSRN contains the information of routing in the PLMN. An MSRN can also be used as the global title (GT) of Signaling Connection Control Part (SCCP) signaling for searching for the MSC visited by a roaming subscriber at present. It is unique within the coverage of a VLR.The coding scheme of an MSRN is the same as that of an MSISDN, shown as in Figure 1.
A typical MSRN example is 86139025553.
HON Number
During the handover between two MSCs, a handover number (HON) is temporarily allocated by the VLR to an MS for setting up a speech channel between the two MSCs. In applications, the composition of a HON is the same as that of an MSRN. Therefore, the MSRNs and HONs that can be used by the MSC Server are uniformly managed and allocated by the VLR.The coding scheme of a HON is the same as that of an MSISDN, shown as in Figure 1.
A typical HON example is 86139025553.
