[from-internal]
exten = 100,1,Answer()
same = n, Wait(1)
same = n. Playback(hello-world)
same = n, Hangup()
[root@localhost asterisk]# cat pjsip.conf
[transport-udp]
type=transport
protocol=udp
bind=0.0.0.0

[6001]
type=endpoint
context=from-internal
dasallow=all
allow=ulaw
auth=6001
aors=6001

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

[6001]
type=aor
max_contacts=1