Avamprogetto 2b

PTSS Domain CSP Domain HP HP HP in-house in-house NE point-to-point NE NE point-to-point NE LEMF

MD vs. vs. HP HP HP meshed in-house meshed in-house NE NE NE NE LEMF

LI-HP non-coincident DN-HP Figure 5 Concatenated delivery network with in-house handover point

CSP Domain HP PTSS Domain HP in-span HP in-span NE point-to-point NE NE point-to-point NE LEMF

MD vs. HP vs. HP in-span HP meshed meshed in-span NE NE NE NE LEMF

LI-HP non-coincident DN-HP Figure 6 Concatenated delivery network with in-span handover point

The LI-HP and DN-HP of a CSP are not coincident, which, in the event of an error, requires a triage in a relationship between three parties (CSP (blue), DN provider (grey) and the PTSS (purple)). If the LEMF detects that LI information is missing at the LI-HP, it shall be determined whether the fault lies with the CSP (blue), the DN Provider (grey) or the PTSS (purple). One possible implementation of such a Concatenated DN is variant A “OpenVPN”.

7 CS delivery networks

For the delivery of CS interception data, two different interfaces are used in accordance with Annex 1.

1. HI2 handover interface for Interception Related Information (IRI) via the IP DN.

2. HI3 handover interface for Content of Communication (CC) via the CS DN.

7.1 Delivery of CS IRI (HI2)

CS IRI shall be delivered to the LEMF via one of the IP DNs described in section 8.2. The data volume of the CS IRI is negligible compared with the PS CC and IRI.

7.2 Delivery of CS CC (HI3) via CS DN

The CS delivery network between the CSP and the LEMF comprises only the HI3 interface (CS CC) and is shown in Figure 7. Such a delivery network has been in use since 2003. With the currrent LEMF, a geographical redundancy was introduced. However, the E.164