Hearsay evidence shall not be admitted in civil proceedings if or to the extent that it is shown to consist of, or to be proved by means of, a statement made by a person who at the time he made the statement was not competent as a witness.
Where in civil proceedings hearsay evidence is adduced and the maker of the original statement, or of any statement relied upon to prove another statement, is not called as a witness—
evidence which if he had been so called would be admissible for the purpose of attacking or supporting his credibility as a witness is admissible for that purpose in the proceedings; and
evidence tending to prove that, whether before or after he made the statement, he made any other statement inconsistent with it is admissible for the purpose of showing that he had contradicted himself.