My company is looking at new phone systems, one of them being VOIP.
I had some questions.
1. If we had VOIP, are all internal<>internal calls free?
2. If we had VOIP, are all internal<>external (where the external party has VOIP too) calls free?
3. How does VOIP costing work if we have VOIP but the other recipient of the phonecall has a standard, digital, line?
4. I understand with some PBX solutions, it's possible to connect to the PBX via Wi-Fi. Does this mean all mobile <> internal calls are free, as well as all mobile <> external? Or, rather, would the mobile <> external calls be charged at the landline cost rather than the mobile cost?