摘要 |
A solution for the Network Address Translation (NAT) traversal problem fo r Real Time Protocol (RTP) is provided, which uses an RTP Proxy (e.g., a Ses sion Border Controller (SBC)), instead of being logically located between th e NAT and the Feature Server (FS), but instead, for devices which use a prot ocol unsupported by the SBC, having these devices first signal the Feature S erver, which determines whether and how an RTP proxy should be invoked. An R TP proxy should be invoked by the FS if Both endpoints (e.g., devices) are b ehind different NATs (or one of the endpoints is behind a NAT and the other is not) and neither of the endpoints are already signaled through an RTP pro xy. For example, the SBC is interposed (at least logically) between the Feat ure Server and other shared components. |