SIP/2.0 401 Unauthorized

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Hello I use Asterisk 13 with FreePBX. When I try to connect my Softphone via VPN to Asterisk I’m registered and It’s show via “pjsip list contacts”

Then I try to call an internal number / other extension I get the following: “SIP/2.0 401 Unauthorized”.

The VPN net is list in pjsip.transports.conf:local_net=10.8.0.0/24 and sip_general_additional.conf:localnet=10.8.0.0/24

I’m not sure whats wrong here. Best Regards