External extension not hanging up



Have a bit of a strange situation.
Have an external VoIP phone that registers just fine, can place and receive calls just fine, audio both ways, but...if the I call the extension from an external number, have a chat and then hangup from the external number, the extension will just behave as if the call was not ended.

If I end the call from the external extension, the call gets correctly ended on both sides.
If I end the call from the external number calling in, the call does not end up on the external extension.
The issue is not present on the local extension (same lan as the PBX)


Never had this one before.

Anyone experienced this isssue and maybe has a fix?


Thank you

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