thinktel

  1. Solved 3CX using Thinktel SIP Trunking - Incoming fails with a 403

    We're using a 3CX v15.5 system, and I've configured Thinktel SIP trunks as per the guidelines published by 3CX. My outgoing trunks work as expected, but I receive 403 errors on the incoming trunks. The Firewall Test ran clean. Anyone have similar challenges with this combination? Any...
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