On any trunk, we add this in the outgoing dial options to limit the amount of time a call can continue.  

Tr, L(21600000,21240000,20700000)

The bicom/pbxware field length is only 20 characters.  To expand the length of the field, right click on the field in the browser, select “Inspect”. 

In the script window on the right, change the value of 20 to 100.

Then go back to the browser window on the left and insert the above string.

Save.