smart,
First your Orion has to be capable of pro-voice, meaning it has to be the right generation, some of the older orions were out before pro-voice existed. Second, you have to pay M/A-Com for the feature and they will send you an updated encrypted feature string to enter into your radio. All the features from M/A-COM are in your radio depending on the generation and capabilities at the time it was manufactured, it just takes the right feature string to turn them on. This feature string is encrypted and is in Hex format. It is different for every radio and based on the Electronic Serial number, so you are kind of stuck.