Hello ! According to my knowledge VoIP phone system is a good system that can help your home in saving expensive monthly.But problem is that
call from VOIP can be received by pstn modem. But pstn cannot make a call to VoIP number.
You need to consider the following factors
1. linex/channel/extension
2. how many user.
3. internet connection
So According to my advice VOIP is expensive for you.
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