Before you start, check with your IT support team or phone system vendor to see if there are any special requirements you need to be aware of. Things like: How long can the recording be? What type of audio file does it need to be? Is there a maximum file size?
Physical media MOH methods provide quality control with prerecorded and licensed CDs, although some units still use cassettes. CDs are designed with or without voice-overs. Brief voice-overs, such as "Calls will be answered in the order that they were received", or "Please hold, your call is important to us," are basic examples. However, many vendors suggest more customized messages.

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USA Business Telephone Today conducted a survey of 30,000 callers to study the effects of hold music, or the lack of it, for a single minute. More than half the callers who were put on hold without any auditory stimulation hung up. The silence affected the rest of the group’s perception of time: More than 27 percent thought their wait time exceeded five minutes, and 18 percent thought it exceeded three minutes. Only 3 percent judged their wait time to be close to the actual one-minute timeframe. All of the callers in the study had listened to dead air for only 60 seconds.