Section: 10.5.4.9 Calling party BCD number
Content: The purpose of the calling party BCD number information element is to identify the origin of a call. The calling party BCD number information element is coded as shown in figure 10.5.93/3GPP TS 24.008[ Mobile radio interface Layer 3 specification; Core network protocols; Stage 3 ]  and table 10.5.120/3GPP TS 24.008[ Mobile radio interface Layer 3 specification; Core network protocols; Stage 3 ] . The calling party BCD number is a type 4 information element. In the network to mobile station direction it has a minimum length of 3 octets and a maximum length of 14 octets. (This information element is not used in the mobile station to network direction.). Figure 10.5.93/3GPP TS 24.008[ Mobile radio interface Layer 3 specification; Core network protocols; Stage 3 ]  Calling party BCD number information element The contents of octets 3, 4, etc. are coded as shown in table 10.5.118. The coding of octet 3a is defined in table 10.5.120 below. If the calling party BCD number contains an odd number of digits, bits 5 to 8 of the last octet shall be filled with an end mark coded as "1111". Table 10.5.120/3GPP TS 24.008[ Mobile radio interface Layer 3 specification; Core network protocols; Stage 3 ] : Calling party BCD number