When I use event_sockets to set a blf (for a nite answer button) it illuminated, but the next subscribe from the phone cancels the light. 
 
Any ideas.
 
Sending  to lite the lamps
 
sendevent PRESENCE_IN
proto: sip
from:
25@group1.sipline.ca
login: 25@group1.sipline.ca
event_type: presence
alt_event_type: dialog
Presence-Call-Direction: inbound
answer-state: confirmed