Setting Up The Modules For Onn Blocking - Nortel ICS Install Manual

Setting up the modules for ONN blocking

To utilize ONN blocking, the CO is alerted by two methods,
either the Vertical Service Code (VSC) or the suppression bit
method. Each method depends on the type of trunk involved in
placing the outgoing call.
Analog trunks use a dialing digit sequence called VSC. Most
COs use the suppression bit method for ONN. You will need
to use the VSC ONN if your CO does not support the
suppression bit method. The VSC differs from region to region
and must be programmed.
• Analog trunks with both tone and pulse dialing trunks can
have separate VSCs.
• BRI trunks support one VSC.
• PRI trunks do not utilize the VSC.
The second method used to alert the CO is by a suppression bit
packaged within the call setup message. BRI trunks can use
either method.
Note: PRI trunks only support the suppression bit method
When you program ONN blocking on a BRI module, you must
indicate which method the BRI trunk will use. The module
loop setting supports two ONN states. You must program the
BRI loop to match the method supported by your service
provider.
If SrvcCode is programmed, then the VSC programmed
•
under Telco Features is used.
If SuprsBit is programmed, then the suppression bit will
•
be packaged in the call setup message.
N0130943 02
of signalling the CO to block the outgoing Name
and Number to the calling party, therefore, no
additional programming is required.
Telco features / 491
Modular ICS 7.1 Installer Guide