MSISDN

 ( Itu-t Recommendations ) 

MSISDN () is a number uniquely identifying a subscription in a GSM or a UMTS mobile network. It is the mapping of the telephone number to the SIM card in a mobile or cellular phone. This abbreviation has several interpretations, the most common one being " Mobile Station International Subscriber Directory Number".The conclusion ("most common") is drawn from the recent documentation from 3GPP and Open Mobile Alliance, please see the Abbreviation section above

The MSISDN and international mobile subscriber identity (IMSI) are two important numbers used for identifying a mobile subscriber. The IMSI is stored in the SIM (the card inserted into the mobile phone), and uniquely identifies the mobile station, its home wireless network, and the home country of the home wireless network. The MSISDN is used for routing calls to the subscriber. The IMSI is often used as a key in the home location register ("subscriber database") and the MSISDN is the number normally dialed to connect a call to the mobile phone. A SIM has a unique IMSI that does not change, while the MSISDN can change in time, i.e. different MSISDNs can be associated with the SIM.

The MSISDN follows the numbering plan defined in the ITU-T recommendation E.164.

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Abbreviation Depending on source or standardization body, the abbreviation MSISDN can be written out in several different ways. These are today the most widespread and common in use.

3GPP ITU OMA	Mobile Subscriber ISDN Number	Vocabulary for 3GPP Specifications (new) 3GPP Vocabulary ITU-T Rec. Q.1741-4 (10/2005) ITU-T Q.1741-4 Dictionary for OMA Specifications OMA Dictionary
CSPS ITU GSM Association	Mobile Station International ISDN Number(s)	MSISDN Format and Details ITU-T Rec. Q.1741-4 (10/2005) Mobile Terms & Acronyms GSMA Acronyms
ITU	Mobile International ISDN Number	Vocabulary of Switching and Signalling Terms ITU Vocabulary

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MSISDN format The ITU-T recommendation E.164 limits the maximum length of an MSISDN to 15 digits. 1-3 digits are reserved for country code. Prefixes are not included (e.g., 00 prefixes an international MSISDN when dialing from Sweden). Minimum length of the MSISDN is not specified by ITU-T but is instead specified in the national numbering plans by the telecommunications regulator in each country.

In GSM and its variant DCS 1800, MSISDN is built up as

MSISDN = CC + NDC + SN

CC = Country Code

NDC = National Destination Code, identifies one or part of a PLMN

SN = Subscriber Number

In the GSM variant PCS 1900, MSISDN is built up as

MSISDN = CC + NPA + SN

CC = Country Code

NPA = Number Planning Area

SN = Subscriber Number

The country code identifies a country or geographical area, and may be between 1-3 digits. The ITU defines and maintains the list of assigned country codes.

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Example Example Number: +880 15 00121121 (Teletalk Hotline Number) Has the following subscription number:

MSISDN=8801500121121
MSISDN=CCCXX N₁N₂N₃N₄N₅N₆N₇N₈

For further information on the MSISDN format, see the ITU-T specification E.164.

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See also

• E.164
• International Mobile Equipment Identity (IMEI)
• International Mobile Subscriber Identity (IMSI)
• SIM card
• Mobile phone
• GSM
• HLR
• E.214
• Mobile identification number
• Telephone number

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External links

• http://www.3gpp.org, GSM 03.03 (see section 3.3)
• http://www.openmobilealliance.org
• http://www.itu.int, E.164, E.212, E.213, E.214
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