Basic call state model

Basic call state model

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

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 processedby an exchange, the call goes through a number of pre-defined phases. These phases of the call aredescribed in the BCSM. The BCSM generally follows the ISUP signalling of a call

tate 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

O-BCSM

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

Detection Points

*1 Origination_Attempt_Authorized
*2 Collected_Info
*3 Analyzed_Info
*4 Route_Select_Failure
*5 O_Called_Party_Busy
*6 O_No_Answer
*7 O_Answer
*8 O_Mid_Call
*9 O_Disconnect10 O_Abandon

T-BCSM

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

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

Messages

* RRB (Request Report BCSM)
* AC (Apply Charging)


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