The class should be SS7D There are SS7C & SS7E on the db both of the Wiki links are linked to the same Wiki page, this page also shows SS7D as a derivative but there aren't any individual pages for the derivatives.
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There are SS7C & SS7E on the db both of the Wiki links are linked to the same Wiki page, this page also shows SS7D as a derivative but there aren't any individual pages for the derivatives.