A sub-routing method and sub-routing device, wherein the method includes: selecting a first sub-route from the route record which includes a plurality of sub-routes during calling procedure; when the selected first sub-route failed, selecting the sub-route which differs from the first sub-route renewedly in the route record according to failure process record. The technology scheme of present invention improves call completing rate, simplifies data collocation and improves the reliability of combining network.
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