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We have a rich history of supporting telecoms operators and lawful interception vendors in meeting law enforcement requirements in the provision of voice and data interception.

Supporting Lawful Intercept

Squire Technologies have a rich history of supporting service providers and lawful interception vendors in meeting law enforcement requirements in the provision of voice and data interception. Starting with pure PSTN TDM solutions Squire Technologies focused on delivering carrier grade product solutions supporting industry standard 3GPP and CALEA interfaces. This has naturally evolved into providing support across todays VoIP networks with Squire Technologies working hand-in-hand with providers of lawful intercept services in delivering comprehensive and innovative solutions.

Squire Technologies provide both an Active and Passive lawful interception architecture allowing clients to target SIP, H.323, SS7, SIGTRAN, ISDN networks while providing output to Recording Devices, Media Servers, Lawful Intercept Mediation Servers or direct to a Law Enforcement Agencies. 

Active Interception

active interception diagram

Passive Interception

passive interception diagram

Lawful Intercept Output

Regardless of whether an Active or Passive management system is deployed the targeted call flow is not interrupted and the intercepted signalling/media can be duplicated to the third party collection server in a range of formats:

  • 3GPP/ETSI Lawful Intercept Standards
  • SIPREC (RFC 7245)
  • SIP, H.323, SS7, SIGTRAN, ISDN
  • SIP Duplication/Forking
lawful intercept output diagram

3GPP ETSI Lawful Interception Standards

Our Lawful Intercept architecture supports the ETSI 101 671 + ETSI TS 102 232-5 specifications providing comprehensive support for H1,H2 and H3 interfaces.

This mode of operation enables integration directly into Law Enforcement Agency and Lawful Intercept Mediation Servers.

lawful interception  standards diagram


The SVI-SBC supports SIPREC as defined in RFC7245. This defines a SRC (Session Recording Client) and a SRS (Session Recording Server). The SBC acts as the SRC.

When a targeted communication is intercepted a SIP session is setup between the SRC and SRS. Through SIP signalling and RTP/RTCP both the media information and the metadata information of the targeted communication are transported to the Session Recording Server.

siprec diagram

SIP Duplication / Forking

The SVI-SBC SIP Duplication Mode is a simplified tapping model that only uses SIP over the HI3 interface to pass the RTP streams to a Media Server device.

For a single targeted communication, two SIP calls are sent to the Media Server with each call containing the duplicated media packet for each leg of the targeted call.

forking diagram

SIP DuplicationForking SIPH.323SS7SigtranISDN

Whether in Active or Passive mode a Squire Technologies lawful interception  solution can provide protocol conversion insuring support for legacy protocols and extending the life of incumbent lawful intercept recording and media devices.

duplicate forking diagram

Further Information

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Download our Lawful Intercept

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Find out more about our
SVI-SBC Session Border Controller

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