Mine

[general]
context=default
bindport=5060
bindaddr=10.2.2.1
srvlookup=yes
relaxdtmf=yes
dtmfmode=rfc2833
;disallow=all
;allow=ulaw
maxexpiry=60
minexpiry=60

regcontext=sipregistrations
checkmwi=10
vmexten=default

allowsubscribe=yes
subscribecontext=dev_hints
notifyringing=no
notifyhold=no

canreinvite=no

rtcachefriends=yes
rtupdate=yes
rtautoclear=no