Create a case using fcClient and the fcSDK, but do not add any phone notes.
Expected: table_case.hangup_time is set to the current time.
Actual: table_case.hangup_time is left blank (null, 1/1/1753)

tested with fcSDK version 2.2.1.17

I also tried it in the Classic Client, and it now looks like the Classic Client is always setting the hangup_time to the current time.

The workaround is simple.
Modify /pages/case/case2.asp

You should see this:
if(case_objid == '0') {
//Call the Create Case API
var ret_int = fccs.create_case_objid_list(

you can change it to this:

if(case_objid == '0') {
fld_list.AppendItem("hangup_time");
val_list.AppendItem("-999");
type_list.AppendItem("Date");

//Call the Create Case API
var ret_int = fccs.create_case_objid_list(