3CX Not recording calls from extension 350 and upwards

[M.Koster]

Dear Readers,

We have a customer that is experiencing problems with the recordings.
Some extensions are not recordings calls, it's from extension 350 and upwards so 351 and 352 aren't recording even though the record all calls is on.
tried different things already.

• Turning recordings off & back on in the extension
• making a test extension after number 350 with recording on
• remaking the extension 350
• Server reboot

Nothing helped.
They have the proffesional license and are on version 16.0.3.676

Hope you guys can help.