Basic call state model

In Intelligent Network and CAMEL switching, a BCSM is a Basic Call State Model.[1]

Types

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

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

O-BCSM

Points in call

Detection Points

T-BCSM

Points in call

Detection Points

Messages

basic INAP call example

References


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