Filters are used to decide which calls to process and which to ignore. The following list explains the parameters that determine what to do with the conditions that are specified in a filter configuration:

• negate — The default value of negate is false .

  • When set to false , the expressions in the filter are assessed together and all specified conditions must match with the call audio's metadata to pass the filter.

  • When set to true , specified conditions must not match with call audio's metadata to pass the filter.

• strict — The default value of strict is true .

  • When strict = true , calls do not pass the filter unless the call audio's metadata contains key-value pairs that meet the defined conditions.

  • When strict = false , filter conditions are ignored if a key-value pair in the call's metadata is missing for the specified condition.

The filter parameter in the [MyHandler] sample below calls on the [PittsburghOutboundCalls] , [PittsburghOutboundCallsLoose] , [NotPittsburghOrOutboundCalls] , and [NotPittsburghOrOutboundCallsLoose] filter configurations:

[MyHandler]
filter = PittsburghOutboundCalls, PittsburghOutboundCallsLoose], NotPittsburghOrOutboundCalls, NotPittsburghOrOutboundCallsLoose

The values defined in the sample above call on the filter configurations defined separately as shown in the samples below:

[PittsburghOutboundCalls]

filter = EventFilter
negate = false
strict = true
# Conditions:
remoteparty = ^412|^878|^724
direction   = ^out$

The [PittsburghOutboundCalls] configuration processes calls that meet the following conditions:

• negate = false — All specified conditions must match with the call audio's metadata to pass the filter.

• strict = true — All specified conditions must be met for the call to pass the filter. Calls that do not contain metadata with the key-value pairs specified in the conditions will not process.

• remoteparty = ^412|^878|^724 — Only calls containing metadata where remoteparty has area codes of 412, 878, and 724 will pass the filter.

• direction = ^out$ — Only calls containing metadata where direction is outbound will pass the filter.

[PittsburghOutboundCallsLoose]

filter = EventFilter
negate = false
strict = false
# Conditions:
remoteparty = ^412|^878|^724
direction   = ^out$

The [PittsburghOutboundCallsLoose] configuration processes calls that meet the following conditions:

• negate = false — All specified conditions must match with the call audio's metadata to pass the filter.

• strict = false — Ignores the specified filter condition if it's key-value pair is missing from the call audio's metadata.

• remoteparty = ^412|^878|^724 — Calls containing metadata with area codes of 412, 878, and 724 will pass the filter; However, because strict = false , calls that do not contain remoteparty metadata (or a missing value) will also pass the filter.

• direction = ^out$ — Outbound calls will pass the filter; however, because strict = false , calls that do not contain direction metadata (or a missing value) will also pass the filter.

[NotPittsburghOrOutboundCalls]

Filter = EventFilter
negate = true
strict = true
# Conditions:
remoteparty = ^412|^878|^724
direction   = ^out$

The [NotPittsburghOrOutboundCalls] configuration processes calls that meet the following conditions:

• negate = true — Specified conditions must not match with call audio metadata for the call to pass the filter.

• strict = true — All specified conditions must be met for the call to pass the filter. Calls that do not contain metadata with the key-value pairs specified in the conditions will not process.

• remoteparty = ^412|^878|^724 — Calls containing metadata with area codes of 412, 878, and 724 will not pass the filter. Calls only process if the metadata has a remoteparty value that does not match 412, 878, or 724.

• direction = ^out$ — Only calls containing metadata where direction is not outbound will pass the filter.

[NotPittsburghOrOutboundCallsLoose]

Filter = EventFilter
negate = true
strict = false
# Conditions:
remoteparty = ^412|^878|^724
direction   = ^out$

The [NotPittsburghOrOutboundCallsLoose] configuration processes calls that meet the following conditions:

• negate = true — Specified conditions must not match with call audio metadata for the call to pass the filter.

• strict = false — Ignores filter conditions if key-value pairs are missing from the call audio's metadata.

• remoteparty = ^412|^878|^724 — Calls containing metadata with area codes of 412, 878, and 724 will not pass the filter. Calls will process if the metadata has a remoteparty value that does not match 412, 878, or 724; in addition, because strict = false , calls that do not contain remoteparty metadata (or a missing value) will also pass the filter.

• direction = ^out$ — The call will only pass the filter if call direction is not outbound; however, because strict = false , calls that do not contain direction metadata or a missing value will also pass the filter.

The following table includes a sample list of filter conditions that vary depending on the telephony system in use: