Configuring a Trunk,
Trunk Configuration Settings for SIP Trunks
For clarification, there are NO SIP ICTs.
There are SIP trunks AND there are ICT non-GK controlled and GK controlled.
If what you want is to configure a connection between CUCM deployments then what you need is an ICT which provides the highest level of compatibility and that's the whole purpose of it's existence.
Technically you should be able to configure a SIP trunk between servers but the one you should use is an ICT GK or non GK controlled. If only 2 servers then use non-GK controlled.
if this helps, please rate