We finally got it ready – 3CX Phone System V5.1. A lot of hard work of the 3CX team went into that one, and I think it shows. We have made numerous improvements and fixes, and introduced the much awaited 3CX Tunnel feature. The 3CX Tunnel allows for remote extensions and branch offices to be connected via a single TCP port. You no longer need to open a range of ports for RDP and SIP traffic

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