@sergey-vb - would you consider having the new variables as part of $sipt(...)?
So instead of:
``` $sipt_redirection_info $sipt_redirection_number_nai $sipt_redirection_number ```
To have:
``` $sipt(redirection_info) $sipt(redirection_number_nai) $sipt(redirection_number) ```
I think it is better to have them grouped. You can push a new patch for it, no need to do a new PR. Then I can merge.