So I'm new to all this and are pretty much starting at zero. Our Customer is using an analog phone connection that gets converted to digital via a Siemens modem. After that it goes through a Cisco 2821 Router and over ethernet to 4 Cisco servers (CUCM,CUCM,CUU,CUP). Now we are supposed to check whats needed to migrate this whole thing to VoIP. At the moment the rest of the devices in the building are all getting internet access over a second Router (dont know which one exactly atm.). If i get the concept correctly, the communication should go through the regular internet-router. Is there anything else needed to realize this other than the existing hardware? I hope my info is precise enough and thanks in advance.
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