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Back to Security
Back to SBC System Security
Back to Lawful Intercept
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Overview
acting as P-CSCF or I-BCF can be configured to intercept IMS sessions. This feature can also be used in non-IMS deployments, to intercept audio/video/clearmode and fax streams.The figure below depicts the deployment scenario of the
to support Lawful Interception (LI). Caption |
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1 | SBC for Lawful Interception |
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At a high level, the functions performed by the Lawful Intercept are:
If media interception over UDP and TCP are both
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configured at the CDC, the transport type for interception is decided based on the following conditions:
- For Audio, Video, and FECC interception:
a. First preference is provided to UDP interception. If a CDC configuration for the Mediation server for media contains UDP mediation server information, media is intercepted over UDP.
b. The next preference is provided to TCP interception. If a CDC does not have UDP Mediation server configuration and it has only TCP mediation server configuration for Media, media is intercepted over TCP. - For MSRP interception:
a. Only interception over TCP is supported.
b. If CDC is not configured for TCP interception, interception is not supported. - For BFCP over TCP:
a. Only interception over TCP is supported.
b. If CDC is not configured for TCP interception, interception is not supported. - For BFCP over UDP:
a. Only interception over UDP is supported.
b. If CDC is not configured for UDP interception, interception is not supported.
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The SBC is enhanced to support IMS LI for PS-to-PS Handover scenarios. The enhancement has no impact on the IMS routing. |
EMS/PSX support for LI
For more information on EMS and PSX configuration for Lawful intercept, see Sonus Lawful Intercept.
For configuration details, see Configuring SBC For Lawful Interception.
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