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Back to SBC System Security

 

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Overview

Excerpt

The 

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platforms support Lawful Intercept (LI) functionality using one of the following solutions:

  • Centralized PSX solution consisting of an external PSX, a third-party Intercept Server (IS), and EMS
  • SBC ERE solution consisting of the ERE, a third-party IS and EMA

The

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works in conjunction with the IS, as well as the ERE and EMA (or an external PSX and EMS) to provide call data and call content to law enforcement agencies for calls involving identified intercept subjects. When it receives matching LI criteria in a policy response from the ERE (or PSX), the SBC routes the call as directed and additionally reports call events to the IS. It also sends media stream (call content) to an IP address provided by the IS.

The

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supports three LI flavors:

  • Default LI
  • IMS LI
  • PCSI LI

The following table describes the Call Data Channel (CDC) configuration information required to distinguish between Default LI, IMS LI, and PCSI (P-Com.Session-Info) LI

Intercept StandardVendor IdFlavors
packetCableNone/Utimaco/VerintLegacy LI (default)
packetCableSs8PCSI LI
3gpp/etsiVerint/utimaco/noneIMS LI

Call Data Channel (CDC) Model

The 

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 supports various flavors of LI and a generic Call Data Channel (CDC) model to support any new flavors of LI. The new CDC configuration model is described as follows:

  • The new CDC model co-exists with the old CDC model. The old CDC model is used only to configure default/legacy LI.
  • The new CDC model have introduced two new fields vendorId and interceptStandard to identify and configure the flavors of the LI.
  • Each Mediation Server can be configured to support both signaling and media interception. Separate configuration fields are present under the Mediation Server to handle this functionality.
  • The new CDC model for a given mediation server allows media interception over UDP and/or TCP.
  • The new CDC model for a given mediation server supports signaling interception either over TCP or UDP. It does not support both simultaneously.
Note

The field priIpAddress was used to configure mediation server for IMS LI in SBC 05.00.00S20x VoLTE Release. The field mediaTypeIntercepted was updated with the value "multimedia" to distinguish IMS LI from the Legacy LI.