11:55 Aug 12, 2011
Call dropback, also known as Return to Pivot, is somewhat of a hybrid between the onward routing scheme and the QoR scheme. Unlike onward routing, the call dropback scheme allows the call control to be cranked back to the originating network that is now in charge of handling routing to the recipient network. Similar to the QoR scheme, the originating network routes the call to the recipient while each finds out about porting differently: QoR relies on the centralized NPDB, while CD/RtP depends on the donor network to query its internal NPDB. | 
peer agreement (net): +3