Asterisk <-> Skype for business

I have setup a trunk between SfB 2015 and Asterisk.
I can call from SfB 2015 to my Asterisk users, but not from Asterisk to SfB2015.
When i call i got:

[Jun 19 16:26:58] NOTICE[11329][C-0000002e]: chan_sip.c:24042 handle_response_invite: Failed to authenticate on INVITE to ‘<sip:XXX @ 192.168.96.50>;tag=as01525620’

Can anyone help me?

This is my sip.conf file:
[XXXSFBFE03]
type=peer
port=5060
host=XXX
dtmfmode=rfc2833
context=XXX_IN
qualify=yes
transport=tcp
canreinvite=no
promiscredir=yes
prematuremedia=no
progressinband=no
insecure=invite,port

I have setup SfB to used TCP, and the encryption I have both try to optional and not supported in SFB.

Hope someone can help me out?

Regards Kenneth Dalbjerg

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