| H.323 | ||||||
| Port | Type | Description | H323 Client | Microsoft ILS | H323 MCU | H323 Gatekeeper |
| 80 | Static TCP | HTTP Interface (Optional) | x | |||
| 389 | Static TCP | ILS Registration (LDAP) | x | x | ||
| 1502 | Static TCP | T.120 | x | x | ||
| 1718 | Static TCP | Gatekeepr Discovery | x | x | x | |
| 1719 | Static UDP | Gatekeeper RAS | x | x | x | |
| 1720 | Static TCP | H323 Call Setup | x | x | ||
| 1731 | Static TCP | Audio Call Control | x | x | ||
| 8080 | Static TCP | HTTP Server Push (Optional) | x | |||
| 1024-65535 | Dynamic UDP | H245 Call Parameters | x | x | ||
| 1024-65536 | Dynamic UDP | RTP ( Video Data Streams) | x | x | ||
| 1024-65537 | Dynamic UDP | RTP ( Audio Data Streams) | x | x | ||
| 1024-65538 | Dynamic UDP | RTCP Controle Information | x | x | ||
| Netmeeting | |
| Port | Purpose |
| 389 | Internet Locator Server (TCP) |
| 522 | User Location Service (TCP) |
| 1503 | T.120 (TCP) |
| 1720 | H.323 call setup (TCP) |
| 1731 | Audio call control (TCP) |
| Dynamic | H.323 call control (TCP) |
| Dynamic | H.323 streaming (RTP over UDP) |
| CUSeeMe Pro | |
| H.323 Mode | CUSeeMe Mode |
| 7648 (TCP) | 7648 (TCP) |
| 1720 (TCP - H.323) | 1503 (TCP - T.120) |
| 1503 (TCP - T.120) | 7648 (UDP) |
| 24032 (UDP) |
** Thanks for this information and these charts goes to SURFnet in the Netherlands.