Hi,
I've done some phone system repairs and programming before, but I'm out of my depth on a system upgrade/solution design question here. I'd like to expand my knowledge. Any help greatly appreciated!

Issue: Business wants to upgrade their 4 old Panasonic DBS corded phones to cordless. They are attached to a Panasonic VB-42050, and these are the only phones at the business. Business has 4 phone lines and needs to keep 4 line functionality. I'm unfamiliar with this old hardware and I'm not finding much online. I've only worked with Mitel PBX before.
-Are there any cordless phones that are compatible with the VB-42050?
-If not, is there any point in keeping the VB unit?
-If a replacement for the VB is the way to go, what are some good budget-conscious solutions for 4 lines and 4 cordless phones for business?

Thanks for any help!