Section: 10.5.4.33 Service category
Content: The purpose of the Service category information element is to provide the network with information about services invoked by the user equipment. The Service category information element is coded as shown in figure 10.5.118d/3GPP TS 24.008[ Mobile radio interface Layer 3 specification; Core network protocols; Stage 3 ]  and table 10.5.135d/3GPP TS 24.008[ Mobile radio interface Layer 3 specification; Core network protocols; Stage 3 ]  The Service category is a type 4 information element with a minimum length of 3 octets. Figure 10.5.118d/3GPP TS 24.008[ Mobile radio interface Layer 3 specification; Core network protocols; Stage 3 ]  Service Category information element Table 10.5.135d/3GPP TS 24.008[ Mobile radio interface Layer 3 specification; Core network protocols; Stage 3 ] : Service Category information element Emergency Service Category Value (octet 3) The meaning of the Emergency Category Value is derived from the following settings (see 3GPP TS 22.101[ Service aspects; Service principles ]  [8] clause 10): Bit 1 Police Bit 2 Ambulance Bit 3 Fire Brigade Bit 4 Marine Guard Bit 5 Mountain Rescue Bit 6 manually initiated eCall Bit 7 automatically initiated eCall Bit 8 is spare and set to "0" A mobile station not initiating an eCall shall set bit 6 and bit 7 to "0" and may set one or more of bit 1, bit 2, bit 3, bit 4 or bit 5 to "1". If more than one of these bits is set to "1", routing to a combined emergency centre (e.g. ambulance and fire brigade in Japan) is required. A mobile station initiating an eCall shall set either bit 6 or bit 7 to "1" and shall set all other bits to "0". A MSC supporting eCall shall use the information indicated in bit 6 and bit 7 to route the manually or automatically initiated eCall to an operator defined emergency call centre. If the MSC can not match the received service category to any of the emergency centres, or if no bit is set to "1", the MSC shall route the emergency call to an operator defined default emergency centre.