Asterisk - Starter pjsip.conf with one phone and one provider

pjsip.conf

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

; Phones

[6001]
type=endpoint
context=from-internal
disallow=all
allow=g722
allow=alaw
allow=ulaw
allow=gsm
auth=6001
aors=6001

[6001]
type=auth
auth_type=userpass
password=unsecurepassword
username=6001

[6001]
type=aor
max_contacts=1

; Providers

[example]
type=auth
auth_type=userpass
username=example-username
password=example-password

[example]
type=aor
contact=sip:sip.example.nl

[example]
type=endpoint
context=from-example
disallow=all
allow=g722
allow=alaw
allow=ulaw
allow=gsm
outbound_auth=example
aors=example

[example]
type=identify
endpoint=example
match=sip.example.nl

[example]
type = registration
server_uri=sip:sip.example.nl
client_uri=sip:sip.example.nl
contact_user=s
outbound_auth=example
auth_rejection_permanent=no
retry_interval=30
forbidden_retry_interval=300
max_retries=20