This guide will walk you through the process of setting up a warm spare server.

You will need 2 PBX servers of the same model with identical hardware including analog and digital cards.

Each server must have it's own set of licences for any commercial modules used.

This article assumes the following


SSH Keys

Setting up share keys between the two servers so they can communicate across SSH on port 22.

Begin by creating a user and an SSH key on our warm standby server so that it can log in to the primary production server and transfer backups to itself.

Login to your backup server with an SSH client such as PuTTy, SecureCRT, or other SSH client.

At the prompt type:  sudo -u asterisk ssh-keygen

You will be asked 3 questions, simply press "Enter" to accept the defaults.

Now we will copy the key to the primary server so that the backup server can SSH to the primary server without needing a password. Issue the command. 

At the prompt type: sudo -u asterisk ssh-copy-id -i  /home/asterisk/.ssh/ root@PrimaryServerIP And enter the password when prompted. 

Make sure you replace the PrimaryServerIP with the IP Address of your primary PBX

If this command completes without error we are ready to test:

At the prompt type: ssh -i /home/asterisk/.ssh/id_rsa root@PrimaryServerIP

If all went well you should now be logged in to the Primary server.

Creating Backup Job

Now we will log into the warm spare's administration GUI.

Replace IPADDRESS with the actual IP address of your warm spare. This assumes you are on standard port 80. If you are using a different port or https please adjust accordingly.

Once Logged:

You should now see the following:

We will now define the primary PBX as a new server for this warm spare server to reach into and perform the backup on.

Click on the “Servers” option on the right side and it will bring up a page like this

Click on the "New SSH Server" option so we can setup the information on where and how to connect to the primary PBX to get the backup data from.

We are going to define the following fields for this server and press the “Save” button.

Now that we setup the primary server location information in the backup module we will create an actual backup job by clicking on the “Backups” option on the right side of the screen. which brings us back to the landing screen

Click on "New Backup"

Failing over to backup server

In the event that you would like to make your backup server become the production server we need to perform a few tasks.


We need to update the IP Address of the backup box to be the IP Address that the Primary PBX was so the phones and trunks know how to register to it.

Login to the web UI of the warm spare

You should see the page below

On the right click "Network Settings" you will then see the following:

From here you can change the IP address of the backup server to be the same IP that your production server was.

Don't forget to remove the production server from the network before Updates changing the IP address here or you will have an IP address conflict.