We have two IP Phones, it works fine on rebooting but after few seconds around (30 to 40 seconds) it’s automatically unregistered.
This generally leads to networking issues. If you search for “30 seconds”(with quotes), you’ll see a good amount of posts regarding dropped calls after 30 seconds due to improper network setups.
Are your phones on the same local subnet as the PBX? If not, can you give us some details about the devices/routers involved between your pbx and one of the phones? Packet traces of a registration, and a call might be needed for further troubleshooting.
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