Does your organization have a witty catchphrase or slogan? If so, use that to your advantage. Here is one that could be tailored towards a custom software company:
While there are a number of resources to help coach users in making a proficient voicemail greeting, some users still feel they are not doing enough. As such, there are a number of tools currently available to help even further. a. Professional Voice Recording: Now that you’re versed in the process of recording your greeting, you may feel a burdening sense of responsibility. As such, you may find that weight to be too heavy to lift alone. Well, rest easy. There are a number of companies and services for recording quality professional greetings.

You know that your callers are making inferences about your business and brand. If you want your voicemail recording to leave a positive impression, smile when you record it! Research shows that smiling affects how we speak, and listeners are not only able to identify that people are smiling, but also what the intent is of the smile based on voice intonation alone.
Say that your prospects want to speak to the sales department and so when they realize that they have reached the right department and hear the voicemail messages, they will be compelled to leave their contact details so that the sales team can reach out to them later. They will be relieved.