Hello, I need a pro to give me a in depth understanding about a2billing, freeswitch, softswitch, sbc, transcoding, asterisk, voip, sansay. I have a basic understand but there are some questions I have and need to understand it better than I do right now. Example of a questions. What is the codec with the minimum bandwidth that will allow the receiving party who an ip-pbx ivr auto attendant to allow the dialing party to use dtmf to press the correct extension? I would like 1 hour of the person dedicated to me by chat or phone. Im flexible on the day and time.
