Registration fails over 4G-5G mobile line.

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I use ZOIPER PREMIUM app (on iOS platform) but I can only do it if I access by the wi-fi line at my home and not outside via the 4G-5G mobile line.
The account I use is of the SIP type and is linked to a fixed telephone number converted to VoIP.
Can anyone help me?
Thank you.

asked Feb 12 in iOS by Lion956 (120 points)  
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