Section: 5.2.1 Mobile originating call establishment
Content: The call control entity of the mobile station initiates establishment of a CC connection by requesting the MM sublayer to establish a mobile originating MM connection and entering the "MM connection pending" state. There are two kinds of a mobile originating call: basic call and emergency call. The request to establish an MM connection shall contain a parameter to specify whether the call is a basic or an emergency call. This information may lead to specific qualities of services to be provided by the MM sublayers. Timer T303 is started when the CM SERVICE REQUEST message is sent. For mobile stations supporting eMLPP basic calls may optionally have an associated priority level as defined in 3GPP TS 23.067[ enhanced Multi-Level Precedence and Pre-emption Service (eMLPP); Stage 2 ]  [88]. This information may also lead to specified qualities of service to be provided by the MM sublayers. While being in the "MM connection pending" state, the call entity of the mobile station may cancel the call prior to sending the first call control message according to the rules given in subclause 4.5.1.7. The mobile station supporting multicall that is initiating an emergency call shall release one or more existing call to ensure the emergency call can be established if the multicall supported information stored in the mobile station described in subclauses 5.2.1.2 and 5.2.2.1 indicates the network does not support multicall and some ongoing calls exists. Having entered the "MM connection pending" state, upon MM connection establishment, the call control entity of the mobile station sends a setup message to its peer entity. This setup message is: - a SETUP message, if the call to be established is a basic call, and - an EMERGENCY SETUP message, if the call to be established is an emergency call. NOTE 1: The Extended Local Emergency Numbers List (see 3GPP TS 24.301[ Non-Access-Stratum (NAS) protocol for Evolved Packet System (EPS); Stage 3 ]  [120]) does not apply in this specification. The mobile station then enters the "call initiated" state. Timer T303 is not stopped. The setup message shall contain all the information required by the network to process the call. In particular, the: - SETUP message shall contain the called party address information; - EMERGENCY SETUP message shall contain the emergency category, if the emergency category is available at the MS. If the mobile station supports multicall, it shall include the Stream Identifier (SI) information element. For the first call i.e. when there are no other ongoing calls the SI value shall be 1. For speech calls the mobile station shall indicate all codecs that it supports for UTRAN in the Supported Codec List information element. Codecs for GERAN shall be indicated in the Bearer Capability information element, if this information element is included. Additionally, if the mobile station supports codecs for GERAN and UTRAN, it shall indicate the codecs for GERAN also in the Supported Codec List information element. If the call is a redial attempt to switch from speech to multimedia or vice-versa, the SETUP message shall include the Redial information element. NOTE 2: Redial attempt is defined in 3GPP TR 23.903: "Redial solution for voice-video switching"[115]. If the MS supports the enhanced network-initiated in-call modification procedure as specified in subclause 5.3.4.3, the MS shall indicate this in the Call Control Capabilities IE in the SETUP message. If timer T303 elapses in the "MM connection pending" state, the MM connection in progress shall be aborted and the user shall be informed about the rejection of the call.