IPT design


my name is monsour and i have ccvp certification and would like to know much more in the design of voice network knowing that i have purchased the ccnp voice course it was great but i realy need more information in the scope of (how many voice gateways i need to use , the type of connection for pstn,concurrent calls that can be supported , which gateway can provide calls to pstn (12 calls) and what it is the required connection and cards (isdn PRI)

and others in this scope .

kindly answer me because i have been posting these question in many website without any answer .

Thank you


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