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Distributed Communications System
319
Administration for Network Connectivity
555-233-504 — Issue 1 — April 2000 CID: 77730
B Private Networking
Interactions
• When interworking with non-ISDN trunks or non-Supplementary Service Option
E ISDN trunks, DEFINITY acts as a gateway in the following sense:
~ When a call is tandeming through a DEFINITY system from a non-ISDN
trunk to an SSE trunk or from a non-Option E to an SSE trunk, the system acts
as an incoming gateway.
~ When a call is tandeming through a DEFINITY system from an SSE trunk to a
non-ISDN trunk or from an SSE trunk to a non-Option E trunk, the system acts
as an outgoing gateway.
As an example, when calls come in from the public network to the DCS
network and then are transferred to another extension within the private
network, DEFINITY functions as an incoming gateway and rerouting occurs.
• If a conference call is transferred, rerouting will not occur.
Italian DCS Protocol
Italian DCS Protocol (also known as Enhanced DCS) adds features to the existing
DCS capabilities.EDCS is used primarily in Italy. EDCS adds the following
features:
~ Exchanging information to provide class of restriction (COR) checking
between switches in the EDCS network
~ Providing call-progress information for the attendant
~ Allowing attendant intrusion between a main and a satellite
~ Allowing a main PBX to provide DID/CO intercept treatment rather than the
satellite PBX.
Note: EDCS is not compatible with DCS Over/Under ISDN-PRI. With
EDCS, all nodes must use EDCS. If used with ISDN-PRI,
configure the switch as a DCS node. Also, DCS-ISDN display
enhancements are not currently available in EDCS.
How to administer
Enhanced DCS
Form Field
Feature-Related System
Parameters
• Enhanced DCS Enabled?
• Apply Intercept Locally?
• Enforce PNT-to-PNT Restrictions?