Privileged matter disclosed under

compulsion or without opportunity to claim privilege (a) General Rule. Evidence of a statement or other disclosure of privileged matter is not admissible against the holder of if disclosure was compelled erroneously or was made without an opportunity for the holder of the privilege to claim the privilege. (b) Use of Communications Media. The telephonic transmission of information otherwise privileged under these rules does not affect its privileged character. Use of electronic means of for than communication other transmission of information otherwise privileged under these rules does not affect the privileged character of such means of if use of such information telephone the communication is necessary and in furtherance of the communication.