Section: 5.5.6 Progress
Content: At any time during the establishment or release of a call and during an active call the network may send a PROGRESS message to the mobile station. On receipt of a PROGRESS message during the establishment or release of a call the mobile station shall stop all call control timers related to that call. NOTE: If the PROGRESS has been received before the receipt of a CALL PROCEEDING message, the mobile station will not start timer T310 on receipt of a CALL PROCEEDING message, see subclause 5.2.1.1.3. Figure 5.11/3GPP TS 24.008[ Mobile radio interface Layer 3 specification; Core network protocols; Stage 3 ]  Progress