AT&T 555-230-520 manual Far End Switch Operation, Dnis and VDN Override in an LAI Environment

Functions and Examples

Step 1 of this vector checks the inflow threshold. If the inflow criteria are acceptable, the vector flow drops to Step 2, where the queue-to main split command provides acceptance to the sending switch. Thereafter, Steps 3 through 5 provide a typical queuing-wait scheme.

If, however, the inflow criteria are not acceptable, a branch is made to Step 6. The route-tocommand in this step checks another switch enabled with Look- Ahead Interflow on a “look-ahead” basis. If this “far end” switch rejects the call, a denial message is relayed back to the sending switch, which then drops the Look-Ahead Interflow call attempt. On the other hand, if the far end switch accepts the call, an acceptance message is relayed back to the sending switch.

Note that no ringback is provided in this tandem switch vector. This is necessary so that an acceptance message is not returned to the sending switch. This operation is appropriate for the caller because the sending switch has already returned an announcement before a Look-Ahead Interflow attempt is made to the receiving switch.

Be sure the sending switch is not used as a backup location for the tandem switch or for any of the far end switches. Should the sending switch be administered in this manner, all trunk facilities could be tied up by a single call.

Far End Switch Operation

The far end switch is also unaware that tandeming has taken place. The far end switch functions in the same manner as the receiving switch within the two switch configuration.

DNIS and VDN Override in an LAI Environment

Look-Ahead Interflow handles Dialed Number Identification Service (DNIS) and VDN Override in various ways, depending on a number of different characteristics relevant to the call. Recall that DNIS (described in Chapter 3) allows any agent with a display-equipped voice terminal to receive visual displays that specify the name of the called VDN. Also recall that VDN Override in its basic form (as described in Chapter 3) allows the name of a subsequently routed to VDN to be displayed to the answering agent instead of the name of the originally called VDN.

The following sections discuss how Look-Ahead Interflow handles DNIS and VDN Override.

Answering Agent’s Display

For Look-Ahead Interflow, the DNIS name (the “called” VDN name from the sending switch) is presented on the answering agent’s display on the receiving switch if all of the following are true:

■Look-Ahead Interflow option is enabled

Issue 4 September 1995 8-11