Section: 8.2.15.1 Message definition
Content: This message is sent by the UE to the network - to initiate a CS fallback or 1xCS fallback call or respond to a mobile terminated CS fallback or 1xCS fallback request from the network; or - to request the establishment of a NAS signalling connection and of the radio and S1 bearers for packet services, if the UE needs to provide additional information that cannot be provided via a SERVICE REQUEST message. See table 8.2.15.1. Message type: EXTENDED SERVICE REQUEST Significance: dual Direction: UE to network Table 8.2.15.1: EXTENDED SERVICE REQUEST message content