Wash. Rev. Code § 19.162.030
(1) An information provider that does business in Washington must include a preamble in all program messages for:
(2) The preamble must:
(b) Advise the caller of the price of the call, including:
(3) Mechanisms that provide for the option of bypassing the preamble are only permitted when:
[ 1991 c 191 s 3.]