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Based on the screenshots the VOIP Provider disconnects the phone at 13:13:54 with the BYE message. And you sofphone is OK with that. But it occurs directly after another REGISTER action from you which is not expected at al.

All the OPTION packets after that are just the usual "Let's see if we can mess up and enter" packets that internet is full of.

So see why your (soft)phone is loosing the connection without a packet to show for it. The error is on your end based on the limited data available.