BLF Syntax Issues 8800/9800

[JF77]

I am trying to get a 9871 (also tested on 8865) phone to subscribe to an Event List for BLF hosted on an Asterisk based PBX. I followed the instructions here...

https://www.cisco.com/c/en/us/support/docs/smb/collaboration-endpoints/cisco-ip-phone-7800-series/smb5422-configure-and-monitor-the-line-of-a-coworker-via-blf-on-the.html

But try as I might I cannot get the phone to subscribe.

This is the current syntax I have: fnc=blf+sd+cp;sub=1001@$PROXY;ext=1000@$PROXY

I have also tried the following...
fnc=blf;sub=1001@$PROXY;ext=1000@$PROXY
fnc=blf;sub=BLFLIST@$PROXY;ext=1000@$PROXY

Please see attached images of the Event List in the PBX and the syntax in the line extended function.

Is there some step I am missing to get this set up, or is there something wrong with these extended functions I am using?

Thank you in advance for your help!

[ptomas]

I have this issue as well on an asterisk system.  The issue appears to be that the Cisco 9800 phone subscribes to event type of dialog instead of "presence".  That is only thing that jumps out at me in the packet captures...