[Users] trusted IP with accounting

[ram]

Hi all

iam trying to deploy trusted IP and Accounting
so iam bit confused can some one clarify me how can i achive this

PSTN--OpenerSER(myserver)------------------Customer(Asterisk or ser or any
predictive Dialers)---their clients

1.  how can i give access to the customer to call using his IP, and he can
creat internal Number of users
2. how can i account to his IP address billing in Acc
3. how can i forward to DID from myserver to his server blindly
4. how can i bill that DID billing also, for incoming.

any suggestiong will be great

Ram
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