Switzernet VoIP téléphonie IP Suisse call the world for almost nothing from Switzerland: free calls to Switzerland, Germany, UK, United-States


  Configuration Zoiper


Download application from Apple Store.

Download the app from Apple Store.
Click on Plus (+) -> SIP Account -> Manual configuration. Look at the 3 photos below.




Fill your 4Z.COM number ( 41xxxxxxxxx) and service password and sip number. Look photo 2  below.



Slide down and click on Network Settings.

See if STUN is disabled.