Transcoding Configuration
The Oracle® Enterprise Session Border Controller performs transcoding functions— allowing the entities with incompatible codecs to communicate with each other— between two call legs. The two endpoints can be located in one or two realms or networks. The Oracle® Enterprise Session Border Controller decides to transcode a call by evaluating messages in the SDP offer-answer transaction with respect to system configuration. An SDP offer can be in a SIP message such as an INVITE or a reINVITE, and contains information about the codecs the offerer would like to use. The answerer answers the SDP offer with its own set of supported codecs. reINVITEs are treated as new negotiations, with respect to the actual SDP offerer and answerer. The Oracle® Enterprise Session Border Controller can manipulate an SDP message by reordering codec preference, and by adding and deleting codecs.