Thank you for your answer. If I do have an "advanced dialogic board" does that allow more than one caller to access my menu of prerecorded OGM messages and to leave recorded messages. In other words, is there any equipment that does not use VoIP that will allow caller A and caller B to simultaneously navigate my menu of the same OGMs and to leave messages simultaneously in the same voice mailbox? If yes, does that hardware require 2 or more incoming telephone company phone numbers, or can both callers call the same landline phone number?
If the answer is no, can this be achieved with a VoIP account and if yes, which company has been shown to work in this application?