Lucent Technologies Release 8.2 manual DCS Call Coverage

Distributed Communications System B Private Networking

Call Coverage

DCS Call Coverage provides DCS messaging required for calls to be covered on remote systems when there is a DCS signaling link (BX.25, PPP, or ISDN-PRI) for the trunk groups. Calls to an extension on one system are covered by extensions on remote systems that are administered as coverage points.

Figure 4 shows an example of DCS Call Coverage.

Figure 4. DCS Call Coverage

1.	Station A	7.	PGATE or PI Board
2.	System A - DEFINITY ECS	8.	X.25 or ISDN PRI DCS Signaling
3.	DCS Tie Trunk Groups		Link
		9. Hop or ISDN TSC Gateway
4.	System B - DEFINITY ECS
		10.	Station D
5.	Station C
		11. AUDIX Voice Lines
6.	Station B
		12.	AUDIX - x34000

In Figure 4, calls to Station A can be covered first by Station B, then by Station C or D, and finally by the AUDIX on system A. Alternatively, calls could be covered by Station C, then Station B, then Station D, and so on.

If the called party answers after the call goes to coverage and the coverage point has answered, then the called party, calling party, and coverage point are all conferenced together.

If the called party answers and the coverage point has not answered, the call to the coverage point drops and the called party connects to the calling party.

Exceptions to DCS Call Coverage

DCS Call Coverage is similar to Call Coverage, with the following exceptions:

~Coverage Answer Groups across nodes are not supported.

~Under the following error conditions, a call follows the coverage point’s coverage path.

Administration for Network Connectivity
555-233-504 — Issue 1 — April 2000	CID: 77730	315