Requirements
This tutorial will show you how to use MCPTT (Mission Critical Push To Talk) with ORS using deltachat and browser application on your UE
Make sure your services are up to date
You should have version at least 1.0.322 to use MCPTT. Please ask Rapid.Space to update your service if you do not.
Check you have all necessary services
Check on your panel in the "service" tab that you have these four services:
- gNB or eNB service: orsXX-enb or orsXX-gnb
- Core Network service: orsXX-core-network
- Mail Server service: orsXX-mail-server
- Conference service orsXX-conference
Make sure Core Network service is configured correctly

- Local Domain: You can leave to "ors.rapid.space" or use a domain you own.
Make sure Conference service is configured correctly

- Allow subgroups: true
- Use password: false
- DNS SR URL: Make sure this is identical to the URL on the "Software release" field of your core network service
Make sure Mail Server service is configured correctly

- DNS SR URL: Make sure this is identical to the URL on the "Software release" field of your core network service
Install deltachat on your phone
Go to the play store and install Deltachat on your smartphone (also available on F-Droid)
Go to deltachat app

Click Log Into your E-mail account

Click Advanced and set the following parameters

Enter an email and password

- user@domain: user can be anything you want, domain should match the domain displayed on your "mail-server" service "domain" Connection Parameter
- password: anything you want (there is no check currently)
Log in

Add new contact

Send message to new contact

Accept contact on other phone

Add new group

Name your group and Add members

Select members of your group

Go to settings

Go to "Advanced" settings

Scroll down and search for "Video chat" settings

Enter the video conference URL

Please enter the following URL: URL/group/public/$ROOM , where URL is the URL displayed on your conference service.
For instance if you leave the default domain you need to enter: https://conference.ors.rapid.space:8443/group/public/$ROOM
Go to your group and send a video chat invitation

Ignore certificate warning

Your browser will warn you about the certificate, please ignore it. On chrome this requires first clicking "Advanced". You will only have to do this once, your browser should remember your choice.
Ignore certificate warning

Click "Proceed to conference.ors.rapid.space (unsafe)"
Click video chat invitation on other phone

Enter your username

The next time your browser should remember your username.
Use PTT feature in video conference

You can talk while holding the green button to use the Push To Talk feature. The other phone will also hear this even if it is on another app or in sleep mode.