Example Distributed Media Release
The following example shows the network diagram for DMR in a multiple-site VPN environment supported by multiple, distributed Oracle® Enterprise Session Border Controllers.
As shown in the network diagram, UA A and UA B register with the softswitch through Oracle® Enterprise Session Border Controller A while UA C and UA D register with the softswitch through Oracle® Enterprise Session Border Controller B. Without DMR, the media for calls between UA A/UA B and UA C/UA D is steered through both Oracle® Enterprise Session Border Controller A and Oracle® Enterprise Session Border Controller B.
With SIP DMR, the media realm and IPv4 address and port information from the UA's Session Description Protocol (SDP) is encoded into SIP messages (either in the SIP header or in the SDP) as they enter the backbone (public/service provider) network. The information is decoded from SIP messages that come from the backbone network. The decoded address and port information is put into the SDP sent to the UAs in the access (private/customer) network. This functionality allows for the RTP/RTCP to flow directly between the UAs in the access network without traversing the Oracle® Enterprise Session Border Controllers and without passing into the backbone network.