I am trying to set the Alert-Info header and am having troubles getting it to come through. This is what I’m setting "sip_h_Alert-Info='Ring Answer',", . I can’t see anywhere in our codebase that we are stripping this header, but it doesn’t show up in the SIP trace. It is coming trough to the CDR, so we are setting it, but somehow it’s not making it out. I tried adding a 2 to the end of the header name, and then it showed up. I’ve also tried setting just setting "alert_info='Ring Answer',", Is there something special about this header?
Try with case sensitive. Alert-Info