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FreePBX 14 one-way audio over OpenVPN connection with Grandstream

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@hansentech wrote:

We recently upgraded some FreePBX servers from version 12 to 14. Some remote Grandstream phones using an OpenVPN connection suddenly stopped working by not passing along audio to the remote phones in both intercom and external calls. The NAT settings are correct as all other phones work just fine with both internal and external calls. Interestingly enough, the same phones and configuration works with FreePBX 12, just not 14. Also, using an OpenVPN connection on a PC with the X-Lite softphone by CounterPath also works fine with FreePBX 14. The OpenVPN local network is listed in “Asterisk SIP Settings” for NAT’d connections to make external calls (even though in this case we get no audio back to the remote phone for internal calls either.) Does anyone know what might have changed in FreePBX 14 that would prevent the Grandstream GXP21xx phones from working remotely over an OpenVPN connection?

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