Look up: E.214

1. 
   E.214
   the ITU-T standard that defines a mobile identification number or IMSI (International Mobile Subscriber Identity). In effect, a unique identifier for a SIM. Based on the ITU-T E.212 numbering plan, thus allowing the number to be mapped onto an E.164 number to allow routing through SS7 networks. Unfortunately, this mapping does not work in North America.
   Found on http://www.flying-boat.co.uk/glossary/
   
   
2. 
   E.214
   `E.214` is a numbering plan used for delivering mobility management related messages in GSM networks. The E.214 number is derived from the IMSI E.214 numbers are composed of two parts. The first, the E.164 part, is made up of a country code followed by the network code. The second part of the number is made from the MSIN part of the IMSI which identifies an individual subscriber. For more details on the derivation of the E.214 number from the IMS...
   Found on http://en.wikipedia.org/wiki/E.214