SIP-Based Addressing

With the SIP-based addressing described in the SIP Early Media Suppression section, early media suppression is based on the outbound SIP interface realms and the value of their early-media-allow parameter. When the Oracle® Enterprise Session Border Controller forwards a SIP Invite out a SIP interface, the outbound realm is chosen based on the SIP layer information, such as the session agent for the next-hop or the address prefix of the next-hop SIP device. The matching realm’s early-media-allow parameter value then applies to either allow all, block all, or block one-way early media until a 200 ok is received. At that point bidirectional media is allowed. The decision is based on SIP-layer addressing of next-hops.