No audio sometimes on SIP trunk

Good afternoon,

I am facing a strange issue and trying to get my hands on it.

I am trying to port forward to an external SIP extension via a MikroTik cloud service

I am dialing in via PPPoE and I open my ports from MikroTik 10000-20000 and 9240 as my SIP port which I changed in General Sip Settings to the IP of the FreePBX server.

Everything is working as expected I get voice and my phone registers remotely but it breaks my SiP trunk. I call the number I don’t hear my IVR and phone hangs up.

If I disable the port forwarding in the NAT section of the MikroTik the problem resolves but then I can’t register remotely as it makes sense.

Thank you in advance

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