To start with, I'm an Asterisk gimp. I've set up two systems based on FreePBX and Sangoma cards, but nothing beyond what's available from the FPBX panels. Now I'm trying to convince our phones to subscribe to call status. The phones are Snom 370s with the new 7.1.33 firmware. This is supposed to provide Extension Monitoring/Call Pickup List so users can see status of subscribed phones on their display, but there's a vast canyon in my knowledge. The phones' SIP options include these: - Extension Monitoring Call Pickup List: on/off - Extension Monitoring Call Pickup List URI: i.e. email@example.com What do I install or modify in FreePBX or Asterisk to act as the b2bua referee? (Despite many-a-search, my familiarity with b2bua stops at the concept and rumors of patches to Asterisk.) All pointers welcome.