# Ring Office Phone and Mobile Phone Simultaneously

Simultaneous ring lets an incoming call alert both a user's office phone and their mobile phone at once, so calls still get answered when the person steps away from their desk.

## When to use this

People who travel or spend time away from their workstation can easily miss calls that land only on the desk phone. Turning on simultaneous ring for their extension solves this: any call to the extension number rings the mobile phone and every office phone signed in with that extension at the same moment, and the user can pick up on whichever is closest.

## Before you begin

- The extension must already have a mobile number assigned to it.
- At least one outbound route must be configured and available.

:::note
The PBX (Private Branch Exchange, the phone system that routes your calls) rings the mobile by placing an outbound call to it. That is why the extension needs a mobile number on file and why a working outbound route has to exist, the same as it would for any external call.
:::

## Configure simultaneous ring

1. Sign in to the PBX web portal and go to **Extension and Trunk > Extension**, then open the extension you want to edit.
2. Select the **Presence** tab.

   :::note
   The **Presence** tab holds a separate set of options for each of the user's presence statuses (for example Available, Away, Business Trip, or Do Not Disturb). The rule you set here only takes effect while the extension is in the status you pick in the next step.
   :::

3. In the status bar, choose the presence status that this simultaneous-ring rule should apply to.

   :::tip
   Pick the status the user is in when they are most likely to be away from the desk, such as Away or Business Trip. You can repeat these steps for other statuses if you want the mobile to ring in more than one situation.
   :::

4. Under **Options**, set up the following:
   1. Select the **Ring the Mobile Number Simultaneously** checkbox.
   2. Click the edit icon ![Edit](/images/pbx/edit.png) to enter the mobile number.
   3. **Optional:** In the **Prefix** field, add the [outbound route prefix](/pbx/administrator-guide/outbound-dial-pattern/#topic_p2b_hfg_2mb__section_gwj_bjc_fmb) so the PBX can route the call to the mobile phone correctly:
      - If the outbound route has no **Strip** value set, leave **Prefix** empty.
      - If the outbound route does have a **Strip** value, set **Prefix** to match the route's **Patterns**.

      :::caution
      The **Prefix** has to line up with the outbound route so the PBX can dial out to the mobile. If the route strips digits and your **Prefix** does not match the route's **Patterns**, the call to the mobile fails and only the desk phone rings. When in doubt, open the outbound route and compare its **Strip** and **Patterns** values before saving.
      :::
5. Click **Save**, then **Apply**.

   :::note
   **Save** stores your changes, but they do not go live until you click **Apply**, which reloads the PBX configuration.
   :::

## Result

Whenever a call comes in to the extension while the user is in the presence status you selected, the office phones and the mobile phone ring together.