Thanks for the reply Harold. The handset is the 7925g. I've been trying to find information specific to the handset and I'm coming up short.

I've tried to get the Alert-info to trigger ring tones local to the handset with no luck. I've tried a lot variations including their tftp server. I know the document says it can work but I have yet to find a string that will trigger a ringtone from the SIP message.