Choose Your Outbound Caller ID in 3CX V20 Update 10

Select an assigned DID before each external call, with no extra outbound rules to maintain.

Calling from the right business number matters when users represent multiple brands, offices or services. With V20 Update 10, Admins can let users choose which of their assigned DIDs to use before placing an external call. Select the number and 3CX automatically routes the call through the associated SIP trunk and presents the selected DID as the outbound Caller ID.

This option is available in supported 3CX Apps and remains fully controlled by the Admin.

Switch outbound numbers without switching extensions

Users can keep the default route and let 3CX apply its existing outbound rules, or pick one of the DIDs assigned to their extension. Selecting a DID sets both the outbound trunk and the caller ID for that call, so a user supporting two regional offices can call each customer from the relevant local number, without switching extensions, using custom prefixes, or asking an administrator to maintain a separate set of outbound rules.

When an assigned DID is selected, 3CX bypasses the normal outbound-rule match for that call and routes it through the trunk that contains the DID. Selecting the default route keeps the existing outbound rules in control, and if the trunk containing the DID is deleted, the dialer falls back to the default route.

Enable users to select outbound caller ID

The feature is disabled by default. In the Admin Console, go to Admin > System > Options > Apps, enable "Allow Users to Select Outbound Route & Caller ID", and save the change. Once enabled, eligible users see the selector in supported 3CX apps and no new outbound rule is required for a DID-based selection.

In the Web Client and PWA, the dialer shows a "Call using" selector with the default route and the DIDs assigned directly to the user, available both for new calls and during transfers. The latest Android and iOS apps offer the same choice from the keypad, and a user's selection syncs across supported clients until it is changed.

Which DIDs are available, and built-in safeguards

Only DIDs assigned directly to the user's extension appear in the selector. A DID assigned to a department, queue or ring group does not become selectable simply because the user is a member, so it's worth reviewing each user's direct DID assignments before enabling the feature.

Emergency-number routing remains a higher priority than the selected DID and trunk, and blocked-country restrictions also continue to apply.