# Outbound dialing

Outbound calls use E.164 number formatting for destination numbers and Caller
IDs. The called destination, presented Caller ID, and available coverage
determine how each call is routed.

A call can use an in-country local route when the destination and an eligible
DIDWW local DID used as Caller ID belong to the same country and local coverage
is available. Calls that do not meet these conditions use another available
route. Some destinations may also use origin-based pricing, where the rate is
determined from the country represented by the Caller ID.

## Number format

Calls to the [DIDWW Outbound gateway](../outbound-sip-information.html#voice-out-signaling-endpoints)
should be sent in the E.164 dialing format: country code + area code +
subscriber number. Any leading prefixes such as `00` or `+` will be
automatically removed before being passed to the PSTN. The same rule applies
for Caller ID. For example:

```
To: Bob <sip:12025550199@out.didww.com>
From: Alice <sip:12025550100@caller.example>
```

The numbers in this example are from the NANPA range reserved for fictional
use.

Caller ID formatting, presentation, and CNAM behavior are covered in
[Caller ID and CNAM OUT](../caller-id-cnam-out.html).

Note

To block calls to unwanted destinations, update the [Destination
dialing settings](../outbound-trunk-reference.html#dialing-settings) on your outbound trunk.

## How route selection works

Route selection is automatic and is based on the destination, presented Caller
ID, and available coverage:

- **Local route:** Used when the destination and an eligible DIDWW local DID
  presented as Caller ID belong to the same country, and an in-country route
  is available.
- **Origin-based route:** Used for affected destinations where the rate is
  determined from the country represented by the Caller ID. This is separate
  from local routing. See [Origin-based
pricing](../../../billing/billing-and-prices/origin-based-pricing.html#origin-based-pricing).
- **International route:** Used when the local-route conditions are not met or
  local coverage is unavailable, and origin-based pricing does not apply.

## Local routes

Local routes, also referred to as in-country routes, enable calling
destinations that may be unreachable when routed via international networks,
such as toll-free, shared-cost, or emergency numbers.

When an eligible DIDWW local DID from the destination country is used as Caller
ID and a corresponding in-country route is available, the call is
automatically routed via the local route. Using local routes is generally more
cost-effective compared to international routing, as local termination rates
typically apply.

Local routes are available in the following countries:

|  |  |  |  |  |  |
| --- | --- | --- | --- | --- | --- |
| Albania | China | France | Latvia | North Macedonia | Slovenia |
| Argentina [[1]](#id3) | Colombia | Georgia | Lithuania | Norway | South Africa |
| Australia | Costa Rica | Germany | Luxembourg | Panama | Spain |
| Austria | Croatia | Hong Kong | Malaysia | Paraguay | Sweden |
| Belgium | Cyprus | Hungary | Malta | Peru | Switzerland |
| Bosnia and Herzegovina | Czech Republic | Iceland | Mexico | Poland | Thailand |
| Brazil | Denmark | Indonesia | Netherlands | Portugal | United Kingdom |
| Bulgaria | Ecuador | Ireland | New Zealand | Puerto Rico | United States |
| Canada | Estonia | Italy | Nicaragua | Singapore |  |
| Chile | Finland | Japan | Nigeria | Slovakia |  |

[[1](#id2)]

For dialing Argentinian mobile numbers, the digit `9` must be added
after the country code. For example, `54 9 XXX XXX XXXX`.

Note

The listed countries require DIDWW DIDs to be used as Caller ID for local
dialing. For more information and country-specific restrictions, contact
the DIDWW Sales department at [sales@didww.com](mailto:sales%40didww.com).

## Related resources

- [Caller ID and CNAM OUT](../caller-id-cnam-out.html) - Configure Caller ID formatting and CNAM
  behavior.
- [Call flow examples](call-flow-examples.html) - Follow Credentials & IP-Based and IP-Only
  outbound SIP calls.
- [Outbound trunk reference](../outbound-trunk-reference.html) - Look up destination dialing
  settings and values.
- [Outbound SIP information](../outbound-sip-information.html) - Find SIP endpoints and transport
  details.

On this page