Hello Brixus,
I am unable to comment as I cannot see your configuration but looking at your trace it seems you constantly trying to subscribe to **624 and **626
I can only assume you have setup some kind of busy lamp field.
Please factory default the phone and only register your line.
The bext step would be to contact WESTCON GROUP EUROPEAN OPERATIONS LTD who sold your VVX410 back in 16/06/2016
Please ensure to provide some feedback if this reply has helped you so other users can profit from your experience.
Best Regards
Steffen Baier
Polycom Global Services
