Can you site those states, because most all states that I have seen have a "Business Use Exception" and Title III of 18 U.S.C. § 2511 provides two exceptions that can enable employers to monitor their employees' phone calls without violating the statute.
1. Buisness extension exemption
2. Consent
As long as employees have been notified that the employer is monitoring their calls/conversations, they are within the law.

