Below is a sample INVITE. I am trying to add “+1” in the Calling Number. So instead of 19255551212, I would like to send +19255181212. Any ideas on how to achieve it.
This is looking like you are using a GUI. If so, you need to ask the question on the forum for the GUI. FreePBX, etc. do not have forums for such questions on this board. I’m guessing FreePBX, for which you want freepbx.org/forums
If you are not using a GUI you need to provide enough of the dialplan to trace the call through from the receiving the incoming dialed number to issuing the Dial application call.