D.12. Call-Disconnect-Notify
Table D.12. CDN
| AVP | No. | Incoming | Outgoing |
| Message Type | 0 | Value 14 | Value 14 |
| Result Code | 1 | Ignored (logged) | Sent as appropriate for tunnel close |
| Q.931 Cause Code | 12 | Ignored | Not sent |
| Assigned Session ID | 14 | Expected, see note | Sent if assigned |
Note that a CDN may have a zero session ID in the header. If this is the case the tunnel ID and assigned session ID are used to identify the session.
If an unknown session ID on a known tunnel ID is received on any any incoming packet a CDN is generated with header session ID 0 and specified assigned session ID.
