My phone vendor will be installing a SIP based VOIP system soon and has requested that I change my internal IP address scope from class a to class c (His words). Although I am a little confused with what he has given me as a suggessted IP scheme. Currently my subnet mask is 255.0.0.0 and my IP addresses start at 18.104.22.168-254. The recommended configuration he wants is subnet mask 255.255.255.0 and my address scope to start at 22.214.171.124.-254 Now it has been a while since I studied TCP/IP but isn't this basically a class c Subnet mask but still a class A address scope. I just want make sure I'm not walking off a cliff when I make the changes and have anymore downtime than needed or have to back track. Will this work? Not really seeing why a class C subnet mask and a class A address scope makes sense. Thanks for any help on this.
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