Nortel BCM 3.7, Manual

Page: 302 / 1004

302 Creating Direct Inward System Access (DISA)
N0008589 3.3
Remote access on loop start trunks
Loop start trunks provide remote access to Business Communications Manager from the public
network. They must be configured to be auto-answer to provide remote system access.
A loop start trunk must have disconnect supervision if it is to operate in the auto-answer mode.
T1 E&M trunks always operate in disconnect supervised mode.
When a caller dials into the system on a line that has auto-answer without no DISA, the system
answers with system dial tone and no COS password is required. In this case, the restriction filters
assigned to the line control system capabilities available to the caller.
When a caller dials in on a line that has auto-answer with DISA, the system answers with stuttered
dial tone. This is the prompt to enter a COS password that determines which system capabilities
are available to the caller.
Remote access on T1 DID trunks
Remote system access on T1 DID trunks is similar to that of T1 E&M trunks connected to a
private network. The main differences are:
• A remote caller is on the public network dialing standard local or long distance telephone
numbers.
• The digits received are delivered by the central office.
• DISA cannot be administered to a T1 DID trunk. You can program the dialed digits to match
those of a specific target line DN, the DISA DN or the Auto DN. If you program the dialed
digits to the DISA DN, only the incoming calls that match the programmed DN will receive a
DISA dial tone. Incoming calls with other digits will route to a target line.
Remote access on PRI
Remote system access on PRI trunks is similar to that of T1 E&M trunks connected to a private
network. The main differences are:
• A remote caller is on the public network dialing standard local or long-distance telephone
numbers.
• The digits received are delivered by the central office.
• Answer with DISA cannot be administered to a PRI trunk. Instead, you can program the dialed
digits to match those of a specific target line DN, the DISA DN or the Auto DN.