Close a Binding

Close the binding between the DUA and the DSA by using one of the following methods:

For outgoing bindings, you can use the unbind_req command, as follows:
```
unbind-req;
```
The DUA discards any unfinished operations and closes the binding.
You can use the abort command, as follows:
```
abort-req;
```
The DUA drops all communication immediately.
Close the TCP link to the DSA.