anchor.diff:  
   externaddr=<%= node[:etc][:external_ip] %>
   
  +directmedia=no
   nat=force_rport,comedia
  -directmedia=no
   rtcachefriends=yes
   autodomain=yes
   allowexternaldomains=yes
  
positive.code: jbmaxsize=200
  jbimpl=adaptive
  
  encryption=yes
  avpf=yes
  force_avp=yes
  icesupport=yes
  
negative.code: dtlssetup=actpass
  
  [authentication]
  <% if node[:sipgate][:activate] %>
  
  [<%= node[:sipgate][:proxy] %>]
  