The Municipal Securities Rulemaking Board has filed a rule change with the Securities and Exchange Commission that would tighten regulation of dealers' muni-related telemarketing practices and require them to respect customers' "do not call" requests indefinitely, rather than for just five years.

The MSRB filed the proposed change to Rule G-39 on telemarketing with the SEC earlier this month in response to a 2011 SEC directive requiring the board to review its telemarketing rules and to make them at least as protective as the rules of the Federal Trade Commission.

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