I'm not exactly sure how this works myself either. Most sip providers charge based on the destination you are calling. I'm not sure how providers do this if they have different rates for local area and national calling areas. I would assume that if you have say a 212 did if you set the caller id string to a 212 number and have a local calling area of 212 that since those both match the provider would give you the call for free. I could be wrong though.
Tom -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Robert McNaught Sent: Monday, March 24, 2008 7:41 PM To: Asterisk Users Mailing List - Non-Commercial Discussion Subject: [asterisk-users] SIP carrier billing technicalities Hi, Does anyone know anything about the following? In a hosted environment where several area DIDs are provisioned on a single server, how do most carriers establish the origination DID, number. Asterisk allows us to modify the CallerID, name, number and DNID channel variables before dialling out via SIP. Most carriers will allow us to spoof a callerID when placing a call, and pass it forward. We can also spoof the DNID also before the call is placed, although I am not sure this is carried forward to the outgoing proxy, using SIP. Do most carriers the carrier just use CallerID as an origination number? As far as I am aware, the concept of a BTN is gone with SIP.... Does this mean its possible to save money on your bill, by modifying CallerID so that the origination number is seen to be a local call? anyone care to comment? Robert _______________________________________________ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users _______________________________________________ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users