Typical Trunk chan_sip PEER and USER details for an Asterisk-based IP-PBX:
PEER DETAILS
insecure=port,invite
secret=no
qualify=yes
host=38.102.250.50
disallow=all
allow=ulaw;alaw;g729
dtmfmode=rfc2833
externip=xxx.xxx.xxx.xxx ;<-- PUBLIC IP ADDRESS
nat=no
canreinvite=no
context=from-internal
type=peer
USER DETAILS
insecure=port,invite
secret=no
qualify=yes
host=38.102.250.60
disallow=all
allow=ulaw;alaw;g729
externip=xxx.xxx.xxx.xxx ;<-- PUBLIC IP ADDRESS
nat=no
canreinvite=no
context=from-trunk
dtmfmode=rfc2833
type=peer
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