# CrazyPBX - How to make a CrazyPBX Extension

> Category: CrazyPBX
> Canonical URL: https://crazytel.com.au/knowledgebase/article/crazypbx-extension

This guide covers how to make a CrazyPBX Extension, and what each option means.

# CrazyPBX - How to make a CrazyPBX Extension

CrazyPBX Extensions are used to connect calls from Crazytel's CrazyPBX servers to an endpoint device. CrazyPBX Extensions are limited to 2 devices per Extension (1 Crazyphone application, 1 physical IP phone).

## How to make a CrazyPBX Extension

1. Sign in to your Crazytel Customer Portal account and click **CrazyPBX**

2. Click **Extensions** from the left-hand menu

3. Click **Create New Extension** on the top-right

4. In the pop-up panel, enter the following information.

    a. **Basic** tab:

    - **Username:** This extension's internal ID (IE, 100). This cannot be changed. This should not be an emergency number.

    - **Password:** A temporary password for this extension. This will be reset when a QR code is generated for sign-in.

    b. **Caller ID** tab:

    - **External Caller ID**: The phone number this Extension calls out on.

    - **Emergency Caller ID**: The phone number shown when calling Emergency services.

5. Click **Create Extension**


Your extension is now active and enabled. Don't forget to set up an inbound number!



## All CrazyPBX Extension options explained:

1. **Basic** tab:
    
    - **Username**: An internal number for this extension. This must be 3 digits minimum, and should not be an emergency number. This cannot be changed later.

    - **Password**: A password for this CrazyPBX Extension. This can be changed later, and will be reset when generating a QR Code

    - **Email address**: The email address Crazytel should send voicemail recordings to for this extension.

1. **Caller ID** tab:

    - **External Caller ID**: This is the phone number displayed to dialed numbers

    - **Internal Caller ID Name**: This is the name that shows when calling other CrazyPBX Extensions on your account

    - **Emergency Caller ID**: This is the phone number that is shown when calling emergency services

    - **Hide External CLI**: Enable to show "anonymous" as your external caller ID

    c. **Voicemail** tab:
    
    - **Voicemail Password**: The voicemailbox access PIN for this CrazyPBX Extension's voicemail

    - **Timezone**: The timezone this CrazyPBX Extension normally operates out of. This allows voicemails to be displayed using local time

    - **Voicemail Greeting**: The voicemail message played when a call reaches this Extension's Voicemail box

    - **Skip VM Instructions**: Enable to skip the voicemail instructions for calls reaching voicemail.

1. **Email** tab:

    - **Email Handling**: Should voicemail messages notify the user (via **Basic** > *email* address)?

    - **After Sending**: How should the voicemail message be handled after the email nofication has been sent (or not sent)

1. **Voicemail to SMS** tab:

    - **SMS Number**: What mobile number should voicemail notifications be sent to?

    - **SMS Handling**: What information should be sent in the SMS message?

1. **Calls and SMS** tab:

    - **Call Settings**: What types of calls can this extension make?

    - **Area Code**: What is the implied area code of this extension (used when dialing 8-digit numbers, removes need for local area calls using area code)

    - **Hold Music**: Extension specific hold music. (Hold music can be configured globally under **CrazyPBX Settings**)

    - **SMS Sender ID**: The Virtual Mobile Phone number to send SMS messages from

    - **Allow Multiple Registrations**: Can this Extension be registered on multiple devices?

    - **Enable SRTP**: ⚠️Advanced⚠️ Secure Real-time Transport Protocol - should calls/SMS messages be encrypyed?
    **CrazyPhone for Mobile does not support SRTP**

    - **Do Not Disturb**: Do not Disturb enable/disable DND for this CrazyPBX Extension

1. **Recording** tab: **NB: Call recording must be enabled on CrazyPBX for these options to be applied**

    - **Recording Settings**: Extension specific recording options. Global options can be configed under the CrazyPBX **CrazyPBX Settings Page** tab.

1. **Destinations** tab:

    - **Ring Timeout**: How long this extension can ring for before the call is 'missed'

    - **Timeout Destination**: Where do missed calls go? (IE, Voicemail for this Extension)

    - **Connect Timeout**: How long can CrazyPBX try to reach this extension for before the extension is marked 'unreachable'

    - **Unreachable Destination**: Where do calls go when this extension can't be reached? (IE, Voicemail for this Extension)

    - **Forward Destination**: **This forwards all calls!!** Where should calls be forwarded to?

    - **Default Failure Destination**: Where do calls go if there is a generic failure?