Call Session Control Function (CSCF)

The Call Session Control Function (CSCF) in IMS comprises three distinct roles: the Proxy CSCF (P-CSCF), the Interrogating CSCF (I-CSCF), and the Serving CSCF (S-CSCF). The CSCF is  implemented via servers using the SIP protocol to communicate with each other and application servers. 

Condition detection by a call session control function (CSCF)

A system configured to receive, from a user device, traffic associated with a request to initiate a call session; detect a condition associated with the traffic; determine whether to establish the call session based on whether the condition, associated with the traffic, is a particular type of condition; send, to a server device, a notification to perform an operation to remedy the condition when the condition does not correspond to the particular type of condition, where sending the notification enables the server device to identify a type of condition, identify an operation that remedies the condition based on the type of condition, or initiate the operation to remedy the condition; and establish the call session when the type of condition corresponds to the particular type of condition, where establishing the call session enables a call, placed by the user device, to be processed as a normal call.

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