asterisk users - Jun 2007 - SPA-2100 Distinctive Ring

I have been looking into how to setup distinctive ringing on a SPA-2100. So
far the only thing i have been able to find is how to define a distinctive
ring in the spa config. What i cannot figure out is what SIP message i need
to be sending to it in order for it use the ring. I did find out how to add
the sip message for distinctive ring i just dont know what variable needs to
be passed in order for it to work.
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> I did find out how to add the sip message for distinctive ring
> i just dont know what variable needs to be passed in
> order for it to work.
Try: SetVar(_ALERT_INFO=Bellcore-r2);

etc.