Protocol: T1 PRI
Follow below steps to achieve this:
1. On the left side of the Protocol Development window, click on any line in the Called party number IE to select it, then select Delete|Information Element
2. Select Add|Information Element|Keypad
3. In the Keypad Type field, select Overlap
4. In the Keypad Interdigit T/O field, set the time to 0.5s
5. In the Protocol Selection|ISDN|Groups panel, set Nailed to Yes
6. In the Action Management window, create an action to Send Overlap: On the Send|Basic panel, select the Dial and Overlap radio buttons, add this action to your script.