Direct Inward System Access Ringing - Panasonic S-ICX Technical Manual

Section 700 - Operation
This can be very useful when a trunk is dedicated to a specific person or purpose. However, this can
be a more expensive use of the line since it has a more limited use.
Prior to Version 4.5, it was impossible to distinguish between Private Line incoming calls and
Directory Number incoming calls. Version 4.5 and higher allows the person receiving the call to
easily distinguish between these types of incoming calls.
Hardware Requirements
• N/A
Considerations
• If the DDI/DL destination is a Directory Number (DN), the call goes to an extension that has a
destination key even if the Primary Directory Number extension is busy or does not answer.
• If the DDI/DL destination is an UNA extension, the UNA will ring depending on DDI number
tenant group/ DL incoming trunk tenant group.

Direct Inward System Access Ringing

DISA Ringing (which is related to the DISA feature) allows a trunk specified as a DISA trunk to ring
and give off-site users dial-in access to the System. Once the DISA trunk is accessed, the user receives
dial tone and may dial an extension.
For more information on DISA, see "Direct Inward System Access" on page 37.
Hardware Requirements
• N/A
Considerations
• N/A
S-ICX-50-700 S-ICX (International) issued October 2000
Chapter 3. System Features
65