Comsys voicemail applicaton is widely considered to be one of the best voicemail applications/platforms.
Please see Comsys website - voicemail description, here: [login to view URL]
Unfortunately, their pricing prevents many start-up service providers from using it.
Your job is to study Comsys features and use open source software to duplicate those features on a different software application. If you are knowledgeable about this subject, then you know you have 3 or 4 different options.
If you have any questions please feel free to ask.
4 freelancers are bidding on average $539 for this job
I know and can help you creating an Astering server on cloud server with voicemail. If you want answer me. if possible say the requirements for the system, please.