Switzernet VoIP téléphonie IP Suisse Weltweit praktisch gratis telefonieren: kostenlos nach Schweiz, Deutschland, Frankreich, Grossbritannien, USA

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  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.
MANDATORY DISABLED STUN