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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 Intercept Server and EMA

The

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works in conjunction with the IS, Intercept Server 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 Intercept Server. It also sends media stream (call content) to an IP address provided by the IS Intercept Server.

The

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supports three four types of LI flavors:

  • Default LI
  • IMS LI
  • PCSI LI
  • PacketCable 2.0 LI


Info

In order to intercept media packets, the EMS must be either the same version or higher version as that of the SBCs and PSXs. 

 

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, and PacketCable 2.0 LI. It also lists the types of LI supported on different platforms:

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1LI Types and Supported Platforms
LI TypeCDC ConfigurationPlatformsRouting PolicyLI InterfaceStream Supported
Intercept StandardVendor Id
Flavors
D-SBCSBC SWe/SBC 5000/7000 SeriesExternal PSXEREX1X2X3D-SBCSBC SWe/SBC 5000/7000 Series
packetCableNone/Utimaco/Verint
Legacy LI (default)
packetCableSs8
PacketCable, PacketCablePlusEtsiNone/Utimaco/Verint

Supported

SupportedSupportedSupportedSOAP
  • RADIUS
  • RADIUS over IPsec
UDPAudio OnlyAudio only
PCSI LIPacketCableSs8SupportedSupportedSupportedNot SupportedTLSNot Supported
  • TCP
  • TCP over IPsec

Audio,Video and T140

Audio, Video and T140
IMS
PCSI
LI3gpp/etsiVerint/utimaco/none/GroupTwoThousandSupportedSupportedSupportedSupportedSOAP
  • DSR
  • DSR over IPsec
  • UDP
  • UDP over IPsec
  • TCP
  • TCP over IPsec
Audio OnlyAll Streams
PacketCable 2.0PacketcableVTwonone
IMS LI
/atos Not SupportedSupportedSupportedNot SupportedSOAP
  • Diameter
  • Diameter over IPsec
  • UDP
  • UDP over IPsec
Not SupportedAudio, Video

Call Data Channel (CDC) Model

The 

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 supports various flavors types of LI and using a generic Call Data Channel (CDC) model to support any new flavors . This facilitates adding support for new types 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 CDC model includes two fields, vendorId and interceptStandard, to identify support identifying and configure configuring the flavors of the various LI types.
  • Each Mediation Server can be configured is configurable 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.
NoteThe 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.