sip.conf(configuration from database): 
context from_anon_sip
allowguest no
allowoverlap no
udpbindaddr 0.0.0.0
transport udp,ws,wss
tcpenable no
tcpbindaddr 0.0.0.0
tlsenable no
srvlookup yes
disallow all
allow ulaw
allow alaw
allow g729
allow g723
allow gsm
allow speex
trustrpid no
sendrpid rpid
dtmfmode rfc2833
videosupport no
maxcallbitrate 384
alwaysauthreject yes
rtptimeout 60
rtpholdtimeout 300
allowsubscribe no
t38pt_udptl yes,redundancy,maxdatagram=1024
nat force_rport,comedia
directmedia no
directrtpsetup no
rtcachefriends yes
rtsavesysname yes
rtupdate yes
rtautoclear 3600
ignoreregexpire no
progressinband never
callcounter yes
use_q850_reason no
defaultexpiry 60
maxexpiry 60