Readdressing of pages upon transition to Pages

[FitToday]

The website is transferred to IPB. Including a contextual part on Pages. 
It is necessary to adjust readdressing of pages from old CMS on new in Pages.
Tell me please, how it is better to realize it?

[bfarber]

If this was a custom/manual conversion, most likely your easiest option is to simply add some redirects in a .htaccess file.

If your old CMS had a lot of pages in a set pattern, you could write a plugin to do this, but for most users this would be more work than it would be worth.