- Intelligent Filters (Termination Route Plan)

Created by Kelly Evans, Modified on Tue, 25 Nov at 1:28 PM by Kelly Evans

The Intelligent Filters allow you to perform call blocking actions for call attempts to Termination Customer Trunk Groups the route plan is assigned to.

Intelligent Filters Summary Overview

Filter Name	Purpose	How It Works	Blocking Criteria	SIP Response When Blocked	Applied To
Enable Short Duration Filter	Prevents calls from callers with a high rate of very short-duration calls	Compares the caller's historical short-duration call rate against a threshold	Caller's short-duration rate exceeds the configured threshold	503 Service Unavailable	Originating and Terminating calls
Intelligent Call Extension	Extends short calls to meet a minimum duration instead of blocking	When a short-duration call is detected, delays sending the BYE until the minimum duration is met	Same as Short Duration Filter, but extends instead of blocking	N/A (call is extended, not blocked)	Originating and Terminating calls
487 Filter	Blocks callers that frequently receive 487 Request Terminated responses	Compares the caller's historical 487 response rate against a threshold	Caller's 487 response rate exceeds the configured threshold	503 Service Unavailable (or media anchoring if enabled)	Terminating calls only
Minimum ANI ASR Filter	Blocks callers with low answer rates	Compares the caller's Answer Seizure Ratio (ASR) against a minimum threshold	Caller's ASR is below the configured minimum threshold	503 Service Unavailable	Terminating calls only
ANI PRV Filtering	Blocks callers that generate low profit per minute	Compares the caller's historical Profit Per Minute Average (PPMA) against a threshold	Caller's PPMA is below the configured threshold	503 Service Unavailable	Terminating calls only
Minimum ANI ACD Filter	Blocks callers with short average call durations	Compares the caller's Average Call Duration (ACD) against a minimum threshold	Caller's ACD is below the configured minimum threshold	503 Service Unavailable	Terminating calls only
Dest. PRV Filtering	Blocks calls to destinations that generate low profit per minute	Compares the destination's historical Profit Per Minute Average (PPMA) against a threshold	Destination's PPMA is below the configured threshold	503 Service Unavailable	Terminating calls only

Note: The SIP response code and SIP reason phase for blocked call attempts will be changed to 603, "Network Blocked" for all Intelligent Filters in an upcoming update to be in compliance with the FCC requirements for analytics-based call blocking.

Metrics Used

Metric	Definition	Calculation
Short Duration Rate (SDR)	Percentage of calls that are shorter than a defined duration	(Number of short calls / Total calls) × 1000
487 Rate	Percentage of calls that receive a 487 Request Terminated response	(Number of 487 responses / Total call attempts) × 1000
Answer Seizure Ratio (ASR)	Percentage of call attempts that result in an answered call (200 OK)	(Number of answered calls / Total call attempts) × 1000
Average Call Duration (ACD)	Average duration of answered calls	Sum of all answered call durations / Number of answered calls
Profit Per Minute Average (PPMA)	Average profit generated per minute of call time	Calculated externally based on call costs and revenue

Filter Behavior Details

Filter	Blocking Logic	Alternative Action (if configured)
Short Duration Filter	Blocks if: Caller's SDR > Threshold	If Intelligent Call Extension is enabled: Extends call duration instead of blocking
487 Filter	Blocks if: Caller's 487 Rate > Threshold	If Media Anchoring is enabled: Routes call through media server instead of blocking
Minimum ANI ASR Filter	Blocks if: Caller's ASR < Minimum Threshold	None - call is blocked
ANI PRV Filtering	Blocks if: Caller's PPMA < Threshold	None - call is blocked
Minimum ANI ACD Filter	Blocks if: Caller's ACD < Minimum Threshold	None - call is blocked
Dest. PRV Filtering	Blocks if: Destination's PPMA < Threshold	None - call is blocked

When Filters Are Applied

Filter	Call Direction	Timing in Call Flow
Short Duration Filter	Both Originating and Terminating	Before call routing, during route plan evaluation
Intelligent Call Extension	Both Originating and Terminating	Applied when Short Duration Filter triggers, executed during call termination
487 Filter	Terminating only	Before call routing, during route plan evaluation

Short Duration Filter	Both Originating and Terminating	Before call routing, during routeplan evaluation
Intelligent Call Extension	Both Originating and Terminating	Applied when Short Duration Filter triggers, executed during call termination
487 Filter	Terminating only	Before call routing, during routeplan evaluation
Minimum ANI ASR Filter	Terminating only	Before call routing, during routeplan evaluation
ANI PRV Filtering	Terminating only	Before call routing, during routeplan evaluation
Minimum ANI ACD Filter	Terminating only	Before call routing, during routeplan evaluation
Dest. PRV Filtering	Terminating only	Before call routing, during routeplan evaluation

Example Scenarios

Scenario	Filter Triggered	Result
Caller with 80% short-duration calls, threshold set to 70%	Short Duration Filter	Call blocked with 503 Service Unavailable
Caller with 80% short-duration calls, threshold 70%, Intelligent Call Extension enabled	Short Duration Filter + Intelligent Call Extension	Call allowed but extended to minimum duration before BYE is sent
Caller with 35% 487 response rate, threshold set to 30%	487 Filter	Call blocked with 503 Service Unavailable (or media anchored if configured)
Caller with 25% ASR, minimum threshold set to 30%	Minimum ANI ASR Filter	Call blocked with 503 Service Unavailable
Caller with $0.50/minute profit, threshold set to $0.75/minute	ANI PRV Filtering	Call blocked with 503 Service Unavailable
Caller with 45-second average call duration, minimum threshold set to 60 seconds	Minimum ANI ACD Filter	Call blocked with 503 Service Unavailable
Destination with $0.40/minute profit, threshold set to $0.60/minute	Dest. PRV Filtering	Call blocked with 503 Service Unavailable

Short Duration Filter

Enabling the Short Duration filter tells the Orchestrator to record behavior and build profiles so that it can block ANIs that have a history of above a designated “Short duration%” on all Trunk Groups associated with the Route Plan. Refer to the Filter report under the Reporting menu in the Peeredge UI to see how much Short Duration traffic is being blocked via this learned behavior.

The following conditions must be met for this filter to provide accurate results:

Steady traffic.
"Normal" behavior.
At least 100 attempts in order to start building a profile.
- Note: There is the possibility that ANIs could be rotated by outbound dialers such that by the time a profile is built, the ANI is not used anymore.

Intelligent Call Extension

This option will tell the Orchestrator to automatically extend calls that are under a designated minimum call time.

487 Filter

A 487 SIP response indicates the SIP INVITE has terminated by BYE or CANCEL request.

For example, a SIP User Agent Server (UAS) sends the 487 response to the client after the client sends a CANCEL request for the original unanswered INVITE request (and has yet to receive a final response).

This filter allows a user to set the percentage of 487 calls that you will accept from the Termination Customer Trunk Group(s) the Route Plan is assigned to.

Requires at least 20 calls.

Intelligent Anchoring

Intelligent Anchoring option for the 487 Filter tells the Orchestrator to anchor a call only when past call behavior suggests the call should be anchored. This allows you to use your available media ports in the most efficient way.

Minimum ANI ASR Filter

This filter allows a user to set the minimum ASR percentage for ANIs of calls that you will accept from the Termination-Customer Trunk Group(s) the Route Plan is assigned to.

ANI PRV Filtering

The ANI PRV Filter tells the Orchestrator to filter traffic based upon a minimum ANI Predictive Routing Value (PRV). Refer to the Glossary for more information on ANI Predicted Routing Value (PRV).

Intelligent Optimization

The Intelligent Optimization option will change the PRV as the traffic parameters change.

Note: When choosing a static PRV, Reports should be checked frequently.

Minimum ANI ACD Filter

This filter allows a user to set the minimum ACD percentage for ANIs of calls that you will accept from the Termination-Customer Trunk Group(s) the Route Plan is assigned to.

Dest. PRV Filtering

The ANI PRV Filter tells the Orchestrator to filter traffic based upon a minimum Destination Predictive Routing Value (PRV).

Intelligent Optimization

The Intelligent Optimization option will change the PRV as the traffic parameters change.

Note: When choosing a static PRV, Reports should be checked frequently.