BLF status from external SIP host

Unanswered Question

I have a SIP trunk from my CUCM over to another PBX (Asterisk).   I configured a phone with a BLF which I routed via this trunk.  

The CUCM subscribes and I give back an OK.    I then go to the other PBX and change the state of the subscribed extension...which generates a notify.   CUCM then 200-OKs the Notify, but I never get any change of status on the CUCM phone.   The only thing that phone ever acknowledges is that he successfully subscribed.

I see me passing the status I set on my PBX in the "<note>" section of the XML.

Is that the right spot?   And...what values should I send?

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