If you’re comfortable doing the recording in-house, but you aren’t sure how to put it all together, you could find a freelancer from a service like Upwork to handle this part for you. You’d select a freelancer to work with, provide them with your files and directions, and let them handle the rest.
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The intro greeting should be a reassurance that the caller has reached the correct organization along with general information about the company, and information that you want the caller to have on hand. Good information to provide at this point might include organizational slogans, years in business and general product information.
You’ll notice that there’s not too much of a difference between the track when played at CD quality and over the phone. All the instruments can still be heard clearly, and the same techniques I used to introduce clipping on the other two tracks had no effect (I could have kept amplifying the track until it did, but it proved the point). And because it’s fairly bland and inoffensive, you’re not going to upset anyone too much if it’s not their cup of tea.