2. section (Continued) 6 Call Layer 3 Processing



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2.6.10 Call Control Processing

2.6.10.1 ANSI-41 Call Control Processing


    As illustrated in Figure 2.6.10.1-1, the ANSI-41 Call Control consists of the following states:

• Waiting for Order Substate - In this substate, the Call Control instance waits for an Alert With Information Message or an Extended Alert With Information Message.

• Waiting for Mobile Station Answer Substate - In this substate, the Call Control instance waits for the user to answer the call.

• Conversation Substate - In this substate, the parties involved in this call communicate.

• Call Release Substate - In this substate, the Call Control instance waits for the call to be disconnected.



Figure 2.6.10.1-1. ANSI-41 Call Control


    Upon instantiation, the Call Control instance shall perform the following:

• If the call is mobile station terminated, and BYPASS_ALERT_ANSWERs is ‘1’, the Control shall enter the Conversation Substate. If the call is mobile station terminated and BYPASS_ALERT_ANSWERs is ‘0’, the Call Control instance shall enter the Waiting for Order Substate.

• If the call is mobile station originated, the Call Control instance shall enter the Conversation Substate.

• If the Call Control instance was instantiated with a ‘reconnection indication’, the Call Control instance shall enter the Conversation Substate.

2.6.10.1.1 Alerting
2.6.10.1.1.1 Waiting for Order Substate

In this substate, the Call Control instance waits for an Alert With Information Message or an Extended Alert With Information Message.

Upon entering the Waiting for Order Substate, the Call Control instance shall set the substate timer for T52m seconds.

While in the Waiting for Order Substate, the Call Control instance shall perform the following:

• If the substate timer expires, the Call Control instance shall send a ‘substate timer expired indication’ to the layer 3.

• If the Call Control instance receives a ‘reset waiting for order substate timer indication’ from the layer 3, the Call Control instance shall reset the substate timer for T52m seconds.

• If the Call Control instance receives a ‘release indication’ from the layer 3, the Call Control instance shall enter the Call Release Substate.

• If the Call Control instance determines that the user directs it to originate an emergency call, the mobile station shall send a Flash With Information Message or an Extended Flash With Information Message in assured mode with a Global Emergency Call Information Record (see 2.7.4.30), as follows:


  • If P_REV_IN_USEs is less than seven, the mobile station shall send a Flash With Information Message. If P_REV_IN_USEs is equal to or greater than seven and if this Call Control instance is identified by NULL, the mobile station shall send either a Flash With Information Message or an Extended Flash With Information Message (with the CON_REF_INCL field of the message set to ‘0’). Otherwise, the mobile station shall send an Extended Flash With Information Message, with the CON_REF_INCL field of the message set to ‘1’ and the CON_REF field of the message set to the connection reference of the service option connection corresponding to this call.

• If the Call Control instance receives a message from the layer 3 which is included in the following list and every message field value is within its permissible range, the Call Control instance shall process the message as described below and in accordance with the message’s action time (see 2.6.4.1.5).

  1. Alert With Information Message: If the message contains a Signal information record, the mobile station should alert the user in accordance with the Signal information record; otherwise, the mobile station should use standard alert as defined in 3.7.5.5. The Call Control instance shall enter the Waiting for Mobile Station Answer Substate (see 2.6.10.1.2).

  2. Extended Alert with Information Message: If the message contains a Signal information record, the mobile station should alert the user in accordance with the Signal information record; otherwise, the mobile station should use standard alert as defined in 3.7.5.5. The Call Control instance shall enter the Waiting for Mobile Station Answer Substate (see 2.6.10.1.2).

  3. Maintenance Order: The Call Control instance shall enter the Waiting for Mobile Station Answer Substate.
2.6.10.1.1.2 Waiting for Mobile Station Answer Substate

In this substate, the Call Control instance waits for the user to answer the mobile station terminated call or to invoke special treatment.

Upon entering the Waiting for Mobile Station Answer Substate, the Call Control instance shall set the substate timer for T53m seconds.

While in the Waiting for Mobile Station Answer Substate, the Call Control instance shall perform the following:

• If the substate timer expires, the Call Control instance shall send a ‘substate timer expired indication’ to the layer 3.

• If the Call Control instance receives a ‘release indication’ from the layer 3, the Call Control instance shall enter the Call Release Substate.

• If the Call Control instance is directed by the user to answer the call, the mobile station shall send a Connect Order in assured mode, as follows:



  • If P_REV_IN_USEs is equal to or greater than seven, the mobile station shall perform the following: If this Call Control instance is identified by NULL, the mobile station shall set the CON_REF_INCL field of the message to ‘0’; otherwise, the mobile station shall set the CON_REF_INCL field of the message to ‘1’ and the CON_REF field of the message to the connection reference of the service option connection corresponding to this call.

The Call Control instance shall enter the Conversation Substate.

• If the Call Control instance is directed by the user to forward the incoming call, the mobile station shall send a Flash With Information Message or an Extended Flash With Information Message in assured mode with a Feature Indicator information record (see 2.7.4.1) with the FEATURE field set to ‘00000000’, as follows:



  • If P_REV_IN_USEs is less than seven, the mobile station shall send a Flash With Information Message. If P_REV_IN_USEs is equal to or greater than seven and if this Call Control instance is identified by NULL, the mobile station shall send either a Flash With Information Message or an Extended Flash With Information Message (with the CON_REF_INCL field of the message set to ‘0’). Otherwise, the mobile station shall send an Extended Flash With Information Message, with the CON_REF_INCL field of the message set to ‘1’ and the CON_REF field of the message set to the connection reference of the service option connection corresponding to this call.

• If the Call Control instance is directed by user to forward the incoming call to a number stored in the mobile station, the mobile station shall send a Flash With Information Message or an Extended Flash With Information Message in assured mode with a Feature Indicator information record (see 2.7.4.1) with the FEATURE field set to ‘00010000’ and a Called Party Number information record set to the forwarding number, as follows:

  • If P_REV_IN_USEs is less than seven, the mobile station shall send a Flash With Information Message. If P_REV_IN_USEs is equal to or greater than seven and if this Call Control instance is identified by NULL, the mobile station shall send either a Flash With Information Message or an Extended Flash With Information Message (with the CON_REF_INCL field of the message set to ‘0’). Otherwise, the mobile station shall send an Extended Flash With Information Message, with the CON_REF_INCL field of the message set to ‘1’ and the CON_REF field of the message set to the connection reference of the service option connection corresponding to this call.

• If the Call Control instance is directed by the user to forward the incoming call to network-based voice mail, the mobile station shall send a Flash With Information Message or an Extended Flash With Information Message in assured mode with a Feature Indicator information record (see 2.7.4.1) with the FEATURE field set to ‘00010001’, as follows:

  • If P_REV_IN_USEs is less than seven, the mobile station shall send a Flash With Information Message. If P_REV_IN_USEs is equal to or greater than seven and if this Call Control instance is identified by NULL, the mobile station shall send either a Flash With Information Message or an Extended Flash With Information Message (with the CON_REF_INCL field of the message set to ‘0’). Otherwise, the mobile station shall send an Extended Flash With Information Message, with the CON_REF_INCL field of the message set to ‘1’ and the CON_REF field of the message set to the connection reference of the service option connection corresponding to this call.

• If the Call Control instance is directed by the user to activate answer holding, the mobile station shall send a Flash With Information Message or an Extended Flash With Information Message in assured mode requiring confirmation of delivery with a Feature Indicator information record (see 2.7.4.1) with the FEATURE field set to ‘00010010’, as follows:

  • If P_REV_IN_USEs is less than seven, the mobile station shall send a Flash With Information Message. If P_REV_IN_USEs is equal to or greater than seven and if this Call Control instance is identified by NULL, the mobile station shall send either a Flash With Information Message or an Extended Flash With Information Message (with the CON_REF_INCL field of the message set to ‘0’). Otherwise, the mobile station shall send an Extended Flash With Information Message, with the CON_REF_INCL field of the message set to ‘1’ and the CON_REF field of the message set to the connection reference of the service option connection corresponding to this call.

After receiving confirmation of delivery of the Flash With Information Message or the Extended Flash With Information Message, the mobile station shall send a Connect Order or an Extended Connect Order in assured mode, as follows:

  • If P_REV_IN_USEs is less than seven, the mobile station shall send a Connect Order. If P_REV_IN_USEs is equal to or greater than seven and if this Call Control instance is identified by NULL, the mobile station shall send either a Connect Order or an Extended Connect Order (with the CON_REF_INCL field of the message set to ‘0’). Otherwise, the mobile station shall send an Extended Connect Order, with the CON_REF_INCL field of the message set to ‘1’ and the CON_REF field of the message set to the connection reference of the service option connection corresponding to this call.

The Call Control instance shall enter the Conversation Substate.

• If the Call Control instance receives an ‘emergency call indication’ from the layer 3, the mobile station shall send a Flash With Information Message or an Extended Flash With Information Message in assured mode with a Global Emergency Call Information Record (see 2.7.4.30), as follows:



  • If P_REV_IN_USEs is less than seven, the mobile station shall send a Flash With Information Message. If P_REV_IN_USEs is equal to or greater than seven and if this Call Control instance is identified by NULL, the mobile station shall send either a Flash With Information Message or an Extended Flash With Information Message (with the CON_REF_INCL field of the message set to ‘0’). Otherwise, the mobile station shall send an Extended Flash With Information Message, with the CON_REF_INCL field of the message set to ‘1’ and the CON_REF field of the message set to the connection reference of the service option connection corresponding to this call.

• If the Call Control instance receives a message from layer 3 which is included in the following list and every message field value is within its permissible range, the Call Control instance shall process the message as described below and in accordance with the message’s action time (see 2.6.4.1.5).

  1. Alert With Information Message: The Call Control instance shall reset the substate timer for T53m seconds. If this message does not contain a Signal information record, the mobile station should use standard alert as defined in 3.7.5.5.

  2. Extended Alert With Information Message: The Call Control instance shall reset the substate timer for T53m seconds. If this message does not contain a Signal information record, the mobile station should use standard alert as defined in 3.7.5.5.

  3. Maintenance Order: The mobile station shall reset the substate timer for T53m seconds.


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