tmsi  IE 

This parameter is the Temporary Mobile Subscriber Identity defined in 3GPP TS 23.003. Since the TMSI has only local significance (i.e. within a VLR and the area controlled by a VLR, or within an SGSN and the area controlled by an SGSN, or within an MME and the area controlled by an MME), the structure and coding of it can be chosen by agreement between operator and manufacturer in order to meet local needs. The TMSI consists of 4 octets.
Reference: TS 29.002-f30   View

Type:

  OctetString

Value Length:

  1 .. 4


Containing Messages
SendGroupCallInfoArg
SendIdentificationArg