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    BCSM (Basic Call State Model)

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    Kanwar Vikas
    The document summarizes the basic call state model (BCSM) used in intelligent network and CAMEL switching. The BCSM defines the states a call passes through from origination to termination. It includes the originating BCSM (O-BCSM) and terminating BCSM (T-BCSM), each with points in a call and detection points to trigger service logic. The BCSM generally follows ISUP call signaling standards.

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    BCSM (Basic Call State Model)

    Uploaded by

    Kanwar Vikas
    2K views3 pages
    The document summarizes the basic call state model (BCSM) used in intelligent network and CAMEL switching. The BCSM defines the states a call passes through from origination to termination. It includes the originating BCSM (O-BCSM) and terminating BCSM (T-BCSM), each with points in a call and detection points to trigger service logic. The BCSM generally follows ISUP call signaling standards.

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    The document summarizes the basic call state model (BCSM) used in intelligent network and CAMEL switching. The BCSM defines the states a call passes through from origination to termination. It includes the originating BCSM (O-BCSM) and terminating BCSM (T-BCSM), each with points in a call and detection points to trigger service logic. The BCSM generally follows ISUP call signaling standards.

    Copyright:

    Attribution Non-Commercial (BY-NC)
    Download as DOC, PDF, TXT or read online from Scribd
    Download as doc, pdf, or txt
    2K views3 pages

    BCSM (Basic Call State Model)

    Uploaded by

    Kanwar Vikas
    The document summarizes the basic call state model (BCSM) used in intelligent network and CAMEL switching. The BCSM defines the states a call passes through from origination to termination. It includes the originating BCSM (O-BCSM) and terminating BCSM (T-BCSM), each with points in a call and detection points to trigger service logic. The BCSM generally follows ISUP call signaling standards.

    Copyright:

    Attribution Non-Commercial (BY-NC)
    Download as DOC, PDF, TXT or read online from Scribd
    Download as doc, pdf, or txt
    of 3

    Basic call state model

    From Wikipedia, the free encyclopedia


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    In Intelligent Network and CAMEL switching, a BCSM is a Basic Call State Model

    Contents
    [hide]

    • 1 Types
    • 2 State machine description
    o 2.1 O-BCSM
     2.1.1 Points in call
     2.1.2 Detection Points
    o 2.2 T-BCSM
     2.2.1 Points in call
     2.2.2 Detection Points

    • 3 Messages

    [edit] Types
    • O-BCSM (Originating BCSM)
    • T-BCSM (Terminating BCSM)

    A fundamental concept for IN control is the basic call state model (BCSM). When a call
    is processed by an exchange, the call goes through a number of pre-defined phases. These
    phases of the call are described in the BCSM. The BCSM generally follows the ISUP
    signalling of a call

    [edit] State machine description


    In the following IN BCSMs, bold Detection Points and Points In Call are also present in
    the CAMEL Ph1 subset.

    TODO: Expand to Ph2,3,4


    [edit] O-BCSM

    [edit] Points in call

    • 1. O_Null & Authorize Origination Attempt


    • 2. Collect_info (Merged with 1. in CAMEL Ph1)
    • 3. Analyze_Info
    • 4. Routing & Alerting (Merged with 3. in CAMEL Ph1)
    • 5. O_Active
    • 6. O_Exception

    [edit] Detection Points

    • 1 Origination_Attempt_Authorized
    • 2 Collected_Info
    • 3 Analyzed_Info (this is the only Statically armed DP, others are dynamically
    armed using "Request Report BCSM (RRBE)" message by the SCP)
    • 4 Route_Select_Failure
    • 5 O_Called_Party_Busy
    • 6 O_No_Answer
    • 7 O_Answer
    • 8 O_Mid_Call
    • 9 O_Disconnect
    • 10 O_Abandon

    [edit] T-BCSM

    [edit] Points in call

    • 7. T_Null & Authorize Termination_Attempt


    • 8. Select_Facility & Present_Call
    • 9. T_Alerting (Merged with 8. in CAMEL Ph1)
    • 10. T_Active
    • 11. T_Exception

    [edit] Detection Points

    • 12 Termination_Attempt_Authorized
    • 13 T_Called_Party_Busy
    • 14 T_No_Answer
    • 15 T_Answer
    • 16 T_Mid_Call
    • 17 T_Disconnect
    • 18 T_Abandon
    basic INAP call example

    • Initial Detection Point (IDP)


    • RRB (Request Report BCSM)
    • Event Report BCSM (ERB)
    • Connect (CONN)
    • Send Charging Information (SCI)
    • AC (Apply Charging)

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