# Filters reference

Buy Numbers filters narrow available DID inventory by location, number type, whether registration is required, supported
features, billing option, area name, and prefix. Use this reference when you need to confirm what each filter means
before purchasing numbers.

## Country and number type filters

Each number type shows the number of available prefixes for the selected country. Number types with no available
prefixes appear unavailable.

| Filter | Description |
| --- | --- |
| **Country** | Filters inventory by the country where you want to purchase phone numbers. |
| **Local** | Shows geographic numbers tied to specific cities or regions. |
| **National** | Shows non-geographic numbers that provide a countrywide presence and are not linked to a specific locality. |
| **Mobile** | Shows numbers assigned to mobile networks. |
| **Toll-free** | Shows numbers that let callers connect without charge. |
| **Shared Cost** | Shows numbers where the call cost is shared between the caller and the recipient. |
| **Global / UIFN** | Shows Universal International Freephone Numbers that allow callers from multiple countries to reach your business using a single number. |

## Geographical selection filters

| Filter | Description |
| --- | --- |
| **State / Region** | Narrows the selection by state or administrative region within the selected country. This option is available only in countries with sub-national divisions, such as the United States, Canada, and the United Kingdom. |
| **NPA/NXX** | Narrows the selection to a specific area code or number prefix. This filter is mainly used in countries with structured numbering plans, such as the United States and Canada. |

## Registration filters

| Filter | Description |
| --- | --- |
| **Required** | Shows registration-required numbers that need end-user information before activation. |
| **Not required** | Shows numbers that do not require End-user verification before activation. |

## Supported feature filters

| Filter | Description |
| --- | --- |
| [inbound-calls](../../_images/feature-icon-inbound-calls%403x.png) **Inbound calls** | Shows numbers that support SIP, PSTN, and phone.systems(TM) call forwarding. |
| [local-cli](../../_images/feature-icon-local-termination%403x.png) **Local CLI** | Shows numbers that can be used as caller ID with DIDWW local routes. |
| [fax](../../_images/feature-icon-fax%403x.png) **Inbound Fax** | Shows numbers that support T.38 or G.711u passthrough. |
| [sms-in](../../_images/feature-icon-p-2-p-sms-in%403x.png) **Inbound SMS** | Shows numbers that support SMPP, HTTP, and Email SMS delivery. |
| [a2p](../../_images/feature-icon-ap-2-sms%403x.png) **Outbound A2P SMS** | Shows numbers that can be registered as Long-code Sender IDs for DIDWW A2P messaging through SMPP and HTTP. |
| [sms-out](../../_images/feature-icon-p-2-p-sms-out%403x.png) **Outbound P2P SMS** | Shows numbers that support SMPP and HTTP SMS delivery. |
| [emergency](../../_images/feature-icon-emergency%403x.png) **Emergency calling** | Shows numbers that can be used to call local emergency service numbers. |
| [cnam](../../_images/feature-icon-cnam%403x.png) **Outbound CNAM** | Shows numbers that support configurable caller name. |

Note

When multiple supported feature filters are selected, only numbers that support all selected features are shown.

## Billing option filters

| Filter | Description |
| --- | --- |
| **Flat Rate** | Shows numbers with a flat-rate pricing model. Dedicated channels are selected in the **Channels Included** field during purchase and cannot be shared with other DIDs. A recurring charge applies. |
| **Metered** | Shows numbers with the Pay-Per-Minute option. These numbers are assigned to a capacity group with 100 channels by default. The number of channels can be adjusted after purchase. Dedicated flat-rate channels are not included. |

## Text search filters

| Filter | Description |
| --- | --- |
| **Area name** | Finds numbers for a specific area or locality. |
| **Prefix** | Finds DID numbers that match the entered number prefix. |

## Related links

- [How to buy numbers](how-to-buy.html#user-panel-buy-numbers-process) - Use filters while purchasing DID numbers.
- [End-user verification](end-user-verification.html#user-panel-end-user-verification) - Understand what the registration filter means for activation.
- [Number Selection Tool](number-selection-tool.html#user-panel-buy-numbers-selection) - Understand selected number search and reservation behavior.

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