| AVP | No. | Usage |
| Acct-Status-Type | 40 | 3 Interim-Update |
| Acct-Delay-Time | 41 | Seconds since accounting data collected |
| Acct-Event-Timestamp | 55 | Data collected time (unix timestamp) |
| Acct-Session-Id | 44 | Unique ID for session |
| Chargeable-User-Identity | 89 | Graph name that applies, sanitised to comply with CQM graph name rules.. |
| Connect-Info | 77 | Text Tx speed/Rx speed in use |
| NAS-Identifier | 32 | Configured hostname of FireBrick |
| NAS-IP-Address | 4 | NAS IPv4 address if using IPv4 |
| NAS-IPv6-Address | 95 | NAS IPv6 address if using IPv6 |
| NAS-Port | 5 | L2TP session ID |
| Acct-Input-Octets | 42 | Rx byte count |
| Acct-Input-Gigawords | 52 | Rx byte count (high 4 bytes) |
| Acct-Output-Octets | 43 | Tx byte count |
| Acct-Output-Gigawords | 53 | Tx byte count (high 4 bytes) |
| Acct-Input-Packets | 47 | Rx packet count |
| Acct-Output-Packets | 48 | Tx packet count |
| Tunnel-Type | 64 | Present for relayed L2TP sessions, L2TP |
| Tunnel-Medium-Type | 65 | Present for relayed L2TP, 1 (IPv4) or 2 (IPv6) |
| Tunnel-Client-Endpoint | 66 | Present for relayed L2TP, text IPv4 or IPv6 address of our address on the outbound tunnel |
| Tunnel-Server-Endpoint | 67 | Present for relayed L2TP, text IPv4 or IPv6 address of the far end address of the outbound tunnel |
| Tunnel-Assignment-ID | 82 | Present for relayed L2TP, text local L2TP tunnel ID |
| Tunnel-Client-Auth-ID | 90 | Present for relayed L2TP, local end hostname quoted by outgoing tunnel |
| Tunnel-Server-Auth-ID | 91 | Present for relayed L2TP, far end hostname quoted by outgoing tunnel |
