Record-Route Addition

When the request is forwarded to a realm where the endpoint’s registrar does not exist, the Oracle® Enterprise Session Border Controller adds a Record-Route header containing the egress SIP interface address. This causes subsequent replies or requests addressed to the GRUU to be routed through the Oracle® Enterprise Session Border Controller first.

When the request is forwarded to the realm where the registrar exists, adding the Record-Route header is unnecessary and does not occur. This is because subsequent requests are directed to the registrar which will ultimately forward them to the Oracle® Enterprise Session Border Controller using the registered Contact in the Request-URI.