# Control the Mobile Client from the Desktop Client

CTI (Computer Telephony Integration) mode lets the Cloud Voice App Desktop Client act as an on-screen control panel for a mobile client signed in under the same extension. You run the call from your computer (dialing, recording, hanging up, and more), while the audio stream stays on the Cloud Voice App Mobile Client on your phone.

:::note
CTI simply means the computer sends the call commands while another device carries the voice. In this mode the Desktop Client is the control panel and your phone is the audio path.
:::

## When to use CTI mode

Suppose you run a CRM (customer relationship management) system on your office computer and place click-to-dial calls through the Desktop Client, but that CRM is locked to the office network. If you connect to the office computer remotely and dial from there, the audio still travels over the office network rather than yours. On an unstable remote link, that can degrade call quality.

CTI mode solves this. Install the Cloud Voice App Mobile Client on your phone, sign in with the same extension, then connect to your office computer and point the Desktop Client at the mobile client over CTI. Audio now routes straight through your phone, so a shaky remote connection no longer affects how your calls sound.

## Requirements

Confirm that your Cloud Voice platform and your clients meet the following:

| Component | Requirement |
| --- | --- |
| Cloud Voice platform | Running version 84.22.0.134 or later. |
| Cloud Voice App Desktop Client | Version 1.21.2 or later. |
| Cloud Voice App Mobile Client | iOS: version 5.24.13 or later. Android: version 5.24.7 or later. Signed in with the same extension used on the Desktop Client. |

:::caution
Both clients must be signed in to the exact same extension. If the extensions differ, the Desktop Client cannot connect to the mobile client and CTI mode will not work. Every version listed above must also be met, or CTI mode will not be available in the menu.
:::

## Turn on CTI mode

1. Sign in to the Cloud Voice App Desktop Client.
2. In the top-right corner, click the CTI icon ![CTI menu icon](/images/pbx/cti.png), then choose **Mobile Client** from the drop-down list.

   :::note
   The CTI icon sits in the top-right corner of the Desktop Client window. Choosing **Mobile Client** is what hands the audio to your phone; until you do this, calls stay on the computer.
   :::

   
   ![Cloud Voice, CTI drop-down with Mobile Client selected as the control target](/images/pbx/cti-mobile-mode.png)

## What you can do

Once the mobile client is connected, use the Desktop Client to run these call operations on it:

- Make and end a call
- Reject a call
- Blind transfer a call (send the call to another number without speaking to that person first)
- Record a call
- Hold and resume a call
- Flip a call (move an in-progress call to another device without dropping it)
- Transcribe a call (turn the call audio into text)

:::note
Answer incoming calls on the Cloud Voice App Mobile Client. You cannot pick up a ringing call from the Desktop Client.
:::