AT&T 7200 series, 7500 series manual Centralized Attendant Service, Automatic Call Distribution

	ELECTRONIC TANDEM NETWORK (ETN) THROUGH THE ETN AND PNA PACKAGES				5-13
_______________________________________________________________________________________
_
	TANDEM
	AAR
	CAS	G1/G2
	BRANCH
	TIE LINE	AAR
	RLT
LDN
		CAS
	RNX		INTELLIGENT
	333	MAIN	MAIN
			D2000 FP8
	TIE	TIE LINE	AAR
	LINE
	AAR	CONSOLES	CAS	SYS. 75
		RLT
	RLT		BRANCH
	TIE LINE	RNX		TIE LINE
	CAS	334
			RNX
	BRANCH	TANDEM		S/T
			234
LDN	RNX
	335		LDN	RNX
	TANDEM			235
				DID

Figure 5-8.Centralized Attendant Service

Centralized Attendant Service

Centralized Attendant Service (CAS) is a feature that offers companies the ability to centralize their attendants at a CAS main switch. Switches with their own listed directory numbers (LDNs), called CAS branches, redirect their attendant calls over RLTs to the CAS main. The RLTs are seized only for outgoing calls from the CAS branch and can be used only for CAS calls and CAS signaling. Either intermachine or access tie trunks carry network calls once CAS returns the calls to their switches of origin.

CAS networks can be standalone, or, when CAS calls must be routed to a destination in another switch after the attendant returns them to their originating switch, they can run concurrently on ETN networks. To understand the basis of CAS design within an ETN, think of the CAS network as being superimposed upon the ETN, since CAS software and ETN networking software coreside on the same switches. (See figure 5- 8.) In fact, when call networking is required, both CAS mains and branches are restricted to communications systems on which AAR is running. AAR is provided through UDP or PNA on the System 75 and Generic 1 communications system; and through the ETN (Standard Network) package on the DIMENSION, System 85, and Generic 2 communications system. Note that CAS mains can only be DIMENSION 600 or 2000, System 75 (R1V3), System 85 (R2V2 through R2V4), and Generic 1 and Generic 2 communications systems.

Automatic Call Distribution

On Generic 1 and Generic 2 communications systems, Automatic Call Distribution (ACD) agents can return their calls to the switch of origin for routing and processing through RLT operation. Note that RLTs cannot be shared across features. Therefore, CAS and ACD cannot use the same RLTs.