Preheat oven to 350 degrees. Grease and flour 3 9-inch round cake pans.
In a large bowl combine the cake mix, milk, eggs, oil, sour cream and orange zest. Beat on medium speed with an electric mixer for 2 minutes.
Carefully fold in cranberries and pecans.
Dived batter evenly between the prepared pans. Bake for about 20 minutes, or until a toothpick inserted in the center comes out clean. Cool in pans for 10 minutes before turning onto wire racks to cool completely.
Meanwhile, prepare the frosting. In a large bowl, beat cream cheese, butter, vanilla and salt until smooth. Stir in the orange zest.
Gradually add the confectioner 's sugar until frosting reaches desired consistency. Stir in the pecans.
Frost between the cake layers as well as the top and sides. Garnish with fresh cranberries or additional chopped nuts, if desired.