We need to build a server in order to retrieve the phone number of callers, without opening the line and hanging up.
The use case is:
- the caller calls a phone number just to notify the server about something
- the line is cut by the server upon the call reception (important: without for the caller to pay anything).
- the server records the caller phone and the date of the call in database.
End of use case.
Can that be done with an Asterisk analog card?
Must I buy a digital card?
Is there a VoIP based solution that can prevent me from buying a digital card?
Thank you for your help