| 摘要 |
The invention provides, in multimedia networks comprising firewalls, an arrangement for a communications unit, especially for H.323 proxies, whereby a network adapter (NA) (2, 4) is provided. The NA (2, 4) provides mechanisms for letting multimedia H.323 traffic through firewalls and a wide range of functionalities such as firewall support, NAT, media stream multiplexing, QoS mechanisms, performance enhancements for signalling connections, eavesdropping, bridging, interacting with media channels, and integrity, authentication and privacy between network adapters of the invention.
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