I made this type of changes.
Sip.conf
[8001]
deny=0.0.0.0/0.0.0.0
type=friend
username=8001
secret=8001test
host=dynamic
context=webrtc
nat=yes
allow=all
incominglimit=1
outgoinglimit=1
rtptimeout=30
qualify=yes
udpbindaddr=0.0.0.0:5060
transport=udp,ws,wss
icesupport=yes

[8002]
deny=0.0.0.0/0.0.0.0
type=friend
username=8002
secret=8002test
host=dynamic
context=webrct
nat=yes
allow=all
incominglimit=1
outgoinglimit=1
rtptimeout=30
qualify=yes
udpbindaddr=0.0.0.0:5060
transport=udp,ws,wss
icesupport=yes

Extension.conf
[sipml5]
exten => _X.,1,Dial(SIP/8002)

rtp.conf
[general]
rtpstart=10000
rtpend=20000
stunaddr=stun.l.google.com:19302

http.conf
[general]
enabled=yes
enablestatic=no
bindaddr=0.0.0.0
bindport=8088