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1. A method for provisioning a backup D channel in a media gateway, the method comprising:
provisioning, via a processor, a primary D channel for an integrated services digital network application on a first media gateway card in the media gateway; provisioning, via the processor, the backup D channel for the integrated services digital network application on a second media gateway card in the media gateway where the second media gateway card is a physically different media gateway card from the first media gateway card, wherein the first media gateway card and the second media gateway card each bridges a core packet network and a time division multiplexing network and provides a call control and signaling functionality, wherein the backup D channel serves as a backup to the primary D channel on the first media gateway card and a plurality of other primary D channels, wherein each one of the plurality of other primary D channels is provisioned on a plurality of different media gateway cards; carrying, via the processor, signaling and control information relating to calls processed by the media gateway over the primary D channel on the first media gateway card, wherein the signaling and control information is contained in an integrated services digital network message; detecting, via the processor, a failure of the primary D channel caused by a hard failure of the first media gateway card, but not a hard failure of the primary D channel; and carrying, via the processor, the signaling and control information over the backup D channel on the second media gateway card in response to the detecting.
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