Mobile-X: Change Extension-to-Extension Caller ID

Written by Marissa Orsini

Updated at April 28th, 2025

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Table of Contents

Configure a Number Transform

Scope

Intended Audience: Reseller and Above

This article will go over changing the caller ID for extension-to-extension Mobile-X calls.

Requirements

A provisioned Mobile-X device
Access to the Mobile-X Control Panel

Since calls using Mobile-X technically have to be routed over mobile or PSTN networks, extension numbers cannot be used for caller ID for extension-to-extension calls with . As an alternative, we provide a few different alternatives:

Number Transform (extension suffixed at the end of a default DID): +1 (555) 555-<extension> (ie +1 (555) 555-1234) (Default)
A Main Number for all extensions
An Assigned Number for a Range of extensions
A specific Source Extension DID

Configure a Number Transform

In the Mobile-X Control Panel, navigate to Groups > the name of the group you'd like to edit > Numbers > Edit Transform Settings
Switch Default Transform to On and set the Extension Length to the length of the extensions on the PBX domain (usually 3 or 4 digits)
Select Save
In the Mobile-X Control Panel, navigate to Groups > the name of the group you'd like to edit > Numbers > Number Transforms
Switch Force a Main Number as the Calling Line ID for all Extensions to On
Select Save
In the Mobile-X Control Panel, navigate to Groups > the name of the group you'd like to edit > Numbers > Ranges
Select Add Range
Enter the following information into the modal that pops up:
1. Name: Range Name
2. Range Start: The first extension in the range (ie '1000')
3. Range End: The last extension in the range (ie '1099')
4. Assigned PBX: UCAASNetwork
5. Main Number: The number you want to show for extension-to-extension calls from this range
Select Save
In the Mobile-X Control Panel, navigate to Groups > the name of the group you'd like to edit > Numbers > Number Transforms
Select Add Transform
Enter the following information into the modal that pops up:
1. Source Number: The extension you'd like to set the caller ID for
2. Mapped E.164: The caller ID shown on the Mobile-X device
Select Save