BOX 1: pjsip.conf
;=============== REGISTRATION
outbound_auth= auth
server_uri=sip:do@XXXXXX
client_uri=sip:do@XXXXXX
retry_interval=60 [do_auth] type=auth
auth_type=userpass
username=do
password=PASSWORD [do] type=aor
contact=sip:XXXXXX:5060 [do] type=endpoint
context=do
disallow=all
allow=ulaw
outbound_auth=auth
aors=do
;[do]
;type=identify
;endpoint=do
;match=XXXXXX
BOX 1: extensions.conf
exten => 1208,1,DIAL(PJSIP/1208@do)
On BOX 2:
Configure your extensions.conf dialplan with the [do] header and put your desired logic.