Frustrating voice mail experience

It was frustrating. To do better next time I collected some little information on how to do it. This one contains rules.
http://www.associatedcontent.com/article/2306/voice_mail_manners_to_send_the_right.html

This one contains samples:

http://www.smallfuel.com/blog/entry/professional-voice-mail-message/

other stuff that is not useful for me right now but it will be
http://www.infotech.siu.edu/telecom/vm_etq.html
http://www.udel.edu/voicemail/vm_information_faculty.shtml

Things to be prepared:

Telephone interview manner

Next time before calling I should prepare for all kinds of cases.