Sip register with outbound proxy

Hi Guys,

Please Help me,
I want to setup sip trunk, but the sip trunk register using outbound proxy
When I try using Xlite softphone its work, but when from issabel, can’t register, could you help me to infrom me the paramater when in xlite setting like this

Username : +62213005XXXX
Domain : ims.indosat.com
Password : *********
Auth Username : +62213005XXXX@ims.indosat.com

Proxy Outbound : 10.215.XXX.XXX

Thanks before.

From the WIKI

https://wiki.asterisk.org/wiki/display/AST/PJSIP+with+Proxies

[myitsp]
type = endpoint
outbound_proxy = sip:10.215.xxx.xxx

[myitsp]
type = aor
contact = sip:ims.indosat.com:5060
outbound_proxy = sip:10.215.xxx.xxx
qualify_frequency = 60

[myitsp]
type = registration
client_uri = sip:+6221305XXX@ims.indosat.com
server_uri = sip:ims.indosat..com
outbound_proxy = sip:10.215.xxx.xxx

[myitsp]
type = identify
match = 10.215.xxx.xxx
endpoint = myitsp

registration part for chan sip
register => [peer?][transport://]user[@domain][:secret[:authuser]]@host[:port][/extension][~expiry]

Where’s the outbound proxy go in that statement?

register => [peer?][transport://]user[@domain][:secret[:authuser]]@host[:port][/extension][~expiry]

on the host part,