No, there is no functional limitations during a Pamela trial period.

For instance Pamela Professional has unlimited call recording and all other functions work the same way as if you would have a license key.

This is the case for all trial versions, Standard, Professional and Business. The only limitation is the trial mode which is 30 days after first installation.

After the trial period is over you can no longer start Pamela. When you start you will see the activation screen instead.

The only thing you can do is access all your data via your PC. This data will also still be accessible when you uninstall Pamela.

You may also opt to purchase and enter an activation code in the window that pops up when you start Pamela. This then removes the trial expiration and Pamela operates without any time limitation from there on.