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DID dilemma!

123anupcisco
Level 1
Level 1

Hi all,

         I have a confusion regarding DID (direct inwards dialing).

        

         when an organization purchases a range of numbers for DID/DOD, does the organization have to use that range for internal and external purposes or else can we assign just any range to our network and use purchased DID range for DID/DOD

Ex: xx xxx 654 31442 ; where xx is country code, xx - state code, xxx 61000 to xxx 61999 - DID/DOD range.

now can i assign 7xxxx to any phone and use the above range to send that call in and out to PSTN.

Can you suggest me a book for understanding Dial plans in enterprise environments for analog/digital/Voip implementations.

Thanks.

5 Replies 5

tobin hawkshaw
Level 1
Level 1

Think of it as private/public IP addresses

You can do what you want inside your network but if you would like those numbers to be reachable from the PSTN you