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 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.

Note

To block calls to unwanted destinations, update the Destination 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.

• 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]	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]

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.

Related resources

• Caller ID and CNAM OUT — Configure Caller ID formatting and CNAM behavior.

• Call flow examples — Follow Credentials & IP-Based and IP-Only outbound SIP calls.

• Outbound trunk reference — Look up destination dialing settings and values.

• Outbound SIP information — Find SIP endpoints and transport details.