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Trunks are a little tricky since many providers have unique requirements. Your final configuration may differ from what you see here.

;==============TRANSPORTS

[simpletrans]
type=transport
protocol=udp
bind=0.0.0.0

;===============TRUNK

[mytrunk]
type=registration
outbound_auth=mytrunk
server_uri=sip:sip.example.com
client_uri=sip:1234567890@sip.example.com
retry_interval=60

[mytrunk]
type=auth
auth_type=userpass
password=1234567890
username=1234567890

[mytrunk]
type=aor
contact=sip:sip.example.com:5060

[mytrunk]
type=endpoint
context=from-external
disallow=all
allow=ulaw
outbound_auth=mytrunk
aors=mytrunk

[mytrunk]
type=identify
endpoint=mytrunk
match=sip.example.com

• "contact=sip:203.0.113.1:5060", we don't define the user portion statically since we'll set that dynamically in dialplan when we call the Dial application.
  See the dialing examples in the section "Dialing using chan_pjsip" for more.

• "outbound_auth=mytrunk", we use "outbound_auth" instead of "auth" since the provider isn't typically going to authenticate with us when calling, but we will probably
  have to authenticate when calling through them.

• We use an identify object to map all traffic from the provider's IP as traffic to that endpoint since the user portion of their From: header may vary with each call.
• This example assumes that sip.example.com resolves to 203.0.113.1

[mytrunk]
type=registration
outbound_auth=mytrunk
server_uri=sip:sip.example.com\;transport=tcp
client_uri=sip:1234567890@sip.example.com\;transport=tcp
retry_interval=60