I have an asterisk installation which is connected to the BT PSTN via an OBI ATA.
My default line configuration is to withhold my number, for certain outgoing numbers I want to display it - this I can easily achieve in the asterisk dialplan by prepending 1470 to the dialed number.
Asterisk has the option to set the trunk CID which has given me further ideas but the question is can I override the outgoing caller id on a BT line - ie change it to something else?
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You would not be able to override the settings from your end, but you can ask BT to allow your number to be released on your phone line, if that is what you want.
If you wanted to block it on a call by call basis, then you would have to add the prefix 141.
Thanks Keith, it would appear to be as I expected.
The dialplan in Asterisk takes care of sending the 1470 / 141 depending on the database lookup of the number being called which will suffice. It was simply an idea that if I could spoof the CLI then I could identify to the recipient exactly "who" is calling (ie which member of the family) rather than from which number the call was made.
No, as I said in the original post I am using an ATA on the BT line to act as a trunk to asterisk.
So all the phones in the house including mobiles are extensions on asterisk, the call only goes analogue when it is routed to the BT line. Asterisk has the ability to set the outgoing CLI so I was wondering if it was possible to deliver this in the call on the BT line. Keith has indicated that this is not possible on a residential line.