SIP Trunk is able to set up in the "SIP Account" menu with next settings:
[Peer name]
type=peer
host=sip.mcntele.com
username=SIP ID
secret=SIP password
nat=yes or no
context=Context of call (dialplan context)
disallow=all
allow=alaw
dtmfmode=rfc2833
canreinvite=no
qualify=no
videosupport=no
t38pt_udptl=yes,redundancy,maxdatagram=400
insecure=invite
fromuser=SIP ID
fromdomain=sip.mcntele.com
Also you should have actual registration:
[general]
register =>; SIP ID:SIP password@sip.mcntele.com/extension number as destination for calls
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