Receiving switch operation

Last Updated : Aug 27, 2019 |
Prolog information
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When the receiving switch receives the LAI request, the call first routes to a VDN. The VDN then maps the call to the receiving switch’s inflow vector, and vector processing begins, starting with inflow checking. Inflow checking is enabled by conditional goto commands in the inflow vector. The decision to accept or deny a call can be based on checks such as any of the following:
  • Expected Wait Time
  • Number of staffed agents
  • Number of available agents
  • Time-of-day or day of the week
  • Number of calls in split queue
  • Average Speed of Answer
  • Active VDN calls
  • Automatic Number Identification (ANI) and Calling Line Identification (CLID)
  • II-Digits
  • CINFO ced or cdpd digits
  • Collected digits forwarded from the sending switch
Once inflow checking is complete, acceptance of the LAI call is accomplished by executing any of the vector commands listed in the call-acceptance vector commands.
Note:
For each command listed in the call-acceptance vector commands, neutral vector commands, and call-denial vector commands, only one of the corresponding qualifications must be true for the command to cause the desired result, which is call acceptance, call denial, or no effect on such acceptance or denial.
The following example shows an inflow vector that can be used by a receiving switch.

Using inflow checking for LAI requests

1. goto step 6 if expected-wait in split 1 pri h > 30
2. queue-to split 1 pri h
3. announcement 4000
4. wait-time 2 seconds hearing music
5. stop
6. busy
Step 1 of this inflow vector checks the inflow thresholds. The goto step command in step 1 checks the expected wait time in split 1. If the expected wait time is greater than 30 seconds, a branch is made to the busy command in step 6. If executed, the busy command denies the call, and the receiving switch returns a call denial message to the sending switch. The sending switch, in turn, drops the LAI call attempt and then continues vector processing at the next vector step.
If the expected wait time in split 1 is less than or equal to 30 seconds, the receiving switch returns a call acceptance message to the sending switch, and call control is passed to the receiving switch. Thereafter, the call is queued to split 1 in the receiving switch (step 2). Once queued, the caller receives the appropriate announcement in step 3 and is then provided with music until the call is answered by an agent or abandoned by the caller (steps 4 and 5). Remember that the stop command halts vector processing but does not drop the call.
If the sending switch does not receive a call acceptance or call denial message within 120 seconds after the LAI call request, the LAI attempt is dropped. The sending switch continues vector processing at the next step.