I'm looking at a way to solve an issue. I have 3 offices with 2 POTS or PTSN dialtones in each office. I would like to add VOIP gateway adapters to each office and create a single unified phone system between all 3 offices. Only one office is open at a time, but would like to have two phones at every office that can access all 6 lines to answer calls or to call out when the current opened office lines are in use. I've seen asterisk working in a single location, so I thought it might be possible to use in this combined office situation.
I think I would want to have an asterisk SME server in each office so if the internet goes down at one location it would not take the other two locations down. The other issue would be having a single voice mail box for all incoming calls not answered. I would want all voice mails to be in one central location if possible for returning calls and be able to get at those voice mails from any phone from any location or through a web browser from any location.
Its a low cost non profit job so I'm trying to do it for very little and donating equipment. I have alot of experience in using SME as a business server, but have never used it as a telephone server as well. Any advice or direction is appreciated. I've done some googling but it seems factory out of the box solutions in the VOIP markets are $7000-10000 range.
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