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    Can not Connect Zoiper to FusionPBX

    Hi Forum, i have installed a FuisonPBX 4.5.25 master on a Debian Linux. After that i configured a SIP Trunk and a test User. Now i want to try to connect to the FusionPBX with a Zoiper Client but every time i try the Log says: [WARNING] sofia_reg.c:1795 SIP auth challenge (INVITE) on sofia...