1. Download the Linphone AppImage from Linphone and make the file executable (e.g. “chmod +x Linphone-*.AppImage”)
2. After the first start you must accept the terms of use and privacy policy of the Belledonne Communications (developer of Linphone)
3. Start the SIP configuration with the highlighted button “ USE A SIP ACCOUNT”
4. Accept the “limitation” with “I UNDERSTAND”
5. Add the SIP credentials and server which you get in the guru3 behind the key sign and set the transport protocol to “UDP”. You confirm the configuration with “USE”.
6. If you configured correctly you should see a green checkmark next to the display name and the user SIP uri.
7. Test the SIP registration with a call to ERNA (Eigene RufNummern Ansage) extension 8330
8. The call should be established and you see the call screen. You should hear your own extension if all is working
9. In the call list you see all incoming and outgoing calls
10. At the top right you have a dial pad
11. You can add additional SIP accounts via the gear and choose “Preferences”
12. At the bottom right you start the configuration for additional SIP accounts via “ADD ACCOUNT”
13. Add the SIP credentials to the …
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Special configuration
Under Preferences → Calls and Chat, “Encryption” needs to be set to “None”.
Similarly, under Preferences → Network, “DTMFs sending method” needs to be set to “SIP INFO” for the labyrinth to work.