Alert-Info SIP INVITE Header is not making it from my PBX through SBC to SIP Phone

Hi all, appreciate any help with this, could someone point me at either the script or settings that would be removing the Alert-Info Headers? I have removed SBC as the proxy and the Alert-Info headers are being passed as expected. Everything else is working with SBC, calls connecting internally and externally with great sound quality. I am using the alert-info headers to pass information for distinctive ring tones for inbound calls.

What you mean is that the SBC removes the Alert-Info, but you need it for distinctive ring tones?

Would you contact with support@telcobridges.com please? Send your signaling capture too. We would like to see your Alert-Info header parameters.

I am using the Alert-Info header to tell my sip phone which ringtone to use, that is what I meant by distinctive ringing. I am using the default setup of SBC recommended in getting started guides for integrating with Asterisk.  Since I am a new member to the forums I am not able to paste the packet capture as it includes links, sending it along to the support email address provided.