Insurance agents have to deal with large numbers of clients almost all through the year. So, they are extremely busy and cannot take calls of clients. For them resorting to voicemail messages become inevitable. Here is one instance of VOIP phone service for businesses like this:
In the notification area, you will see the Voicemail symbol appear when you receive a new voicemail.

Hello, you have reached the law offices of X. Unfortunately, I am attending to another client right now, but I will return your call as soon as I can. Please leave me your name, reason for calling, and your number so I can connect you with the right department. This is far more professional than the other examples given in this guide. Lawyers should always be formal, smooth, and confident. Nobody is calling to make friends. They’re calling to get the job done. That’s why your message should be all business.
Ive been saving my grandmothers voicemails for almost 8 years now and when i went to upgrade my phone, i almost fainted when the rep told me they were going to be erased. Thanksfully he put us in touch with a company called http://www.voicemailsforever.com and they ended up much cheaper than the one you suggested above. i think your readers would benefit because they do it for so much less.