bmac's Journal: open question #1

If I was home-brewing a cellphone app to prioritize my contacts, does anyone out there know if I can send personalized info in the cellphone call header? I know that there is a std packet of info that gets sent (which includes caller id info), but I'd like to add an "urgency" code. Of course, only users of my software could send such a code to my app, but I'm imagining having both ends running this software.

Thanks in advance.