"We would be happy to assist you. The easiest way to check your voicemail on one of your extensions is to simply dial it from your [VOip service's] phone. This will most likely take you right into the voicemail and then it will be like checking any other voicemail, dial *86, enter your pin and your will be on your way to checking your messages."
Completely unresponsive to my question. *grrrr*