This needs to be clarified as I think some people will misunderstand. Oregon is a one party consent state for phone conversations. The all-party consent only applies to in person.
In Washington you don't need the other parties' consent (in the lay sense of the word) if you announce that you are recording and they continue talking. RCW 9.73.030 (3):
> Where consent by all parties is needed pursuant to this chapter, consent shall be considered obtained whenever one party has announced to all other parties engaged in the communication or conversation, in any reasonably effective manner, that such communication or conversation is about to be recorded or transmitted
California, Connecticut, Delaware, Florida, Illinois, Maryland, Massachusetts, Michigan, Montana, Nevada, New Hampshire, Oregon, Pennsylvania, Vermont, and Washington.
15 states. Everyone else is single-party consent.