Sip tcp activate

Hello
I have made a sip trunk to my exchange server with (qualify=yes)to get an “Status OK”. But I only get “UNREACHABLE” under Peers.
Do I have to turn on SIP TCP separat for that trunk or generally ? And if yes where can I find it in the GUI?
This is my config under Peers in the sip trunk page.

type=friend
transport=tcp
qualify=yes
port=5065
insecure=very
host=172.xxx.xxx.xxx
context=from-internal

Thanks for Help
Chris

Found the “problem”:
qualify=yes
was missed.