asterisk users - Aug 2015 - SIP Trunk - problem to connect

Hello! Thnxs for reading!
I've an IPLAN virtual PBX, that allows me to connect via zoiper or gigaset,
for instance (and it works!)
Connection parameters are:

Authentication Name: N?mero 1199999999
Authentication password: 12345678
Username: 1199999999
Display name: 1199999999

Domain: hpbx.iplannetworks.net
Proxy serever address: 190.2.20.2
Proxy server port: 5060
Registrar server: 190.2.20.2
Registrar server port: 5060
Registration refresh time: 1800
Outbound proxy mode: Always
Outbound proxy: 190.2.20.2
Outbound proxy port: 5060

Can I add a trunk to my asteriskNOW having only this parameters?
I've tested some configurations, but I can find the correct one
Could you give me a clue or your point of view?
IPLAN tech support doesn't help with asterisk, only with phone config

One of the configs I tested without success:

register => username:password at hpbx.iplannetworks.net

[myprovidername]
host=hpbx.iplannetworks.net
outboundproxy=190.2.20.2
type=friend
fromuser=username
defaultuser=username
secret=password
context=from-trunk

Thanks a lot
Regards
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