An SR-22 is a certificate from an Oregon-licensed insurance company certifying that you have purchased liability insurance that meets the minimum required coverage limits. The SR-22 provides proof to the DMV that you are insured. If you cancel your insurance or the insurance company cancels your policy before your suspension period is over, the company must notify DMV that the certificate is canceled. You will need to get a new SR-22 certificate on file with DMV within 30 days or your license will be suspended. If you are asked to prove "future financial responsibility" by having an SR-22 on file with DMV, a copy of your insurance binder or your insurance card is not considered acceptable proof. Also, your insurance must cover all vehicles both operated by you and registered in your name.
You will generally need to file an SR-22 if you are convicted of an Oregon DUII and/or if you apply for a hardship permit. If you enter the diversion program on your DUII charge and do not apply for a hardship permit on your implied consent suspension, then you should not need to file an SR-22.