@Nathan-TP I would like to provide an update on my testing. In order to further isolate the cause of the issue, I temporarily replaced the ER7406 with a UniFi Cloud Gateway Ultra. The network...

@Nathan-TP Thank you for your detailed reply and for the troubleshooting suggestions. I am still investigating the issue and appreciate your willingness to assist. As the problem may take several...

@Nathan-TP Thank you for your reply. SIP ALG was intentionally disabled because Auerswald explicitly recommends disabling SIP ALG when operating a COMtrexx PBX behind a router. In addition, I have...

@Nathan-TP Thank you for your reply. Please find my answers below: The ER7406 is managed via the Omada Controller (OC200). I have not tested standalone router mode. Network topology: The setup with...

I am observing an issue with an ER7406 (v1.0, FW 1.3.2) related to SIP registrations of a telephone system and would appreciate your assistance. The setup consists of an Auerswald COMtrexx PBX...