Note the 5 states that maglib mentioned above; Oregon is not one of them. Therefore, the general rule of telecommuters pay tax in the state where they live and work, not to the state where the company is, applies.
But do note the comment above that if you travel to Oregon and there is some income that you received due to work that you did while in Oregon, then you will have to file an Oregon return.
Note that for employees, this typically means that you create a ratio of days spent in Oregon divided by total work days and apply that ratio to your annual salary, this is reported in Oregon.
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