The WP820 phone can only hold 500 contacts. Can Grandstream release a firmware update to expand this number?
You would do better to ask this of Grandstream support directly at https://helpdesk.grandstream.com/
This forum is a user-to-user support forum, and @grandstream may or may not read any given post.
Thanks, I opened a ticket with them as well, and they replied with this:
Unfortunately there is no way to extend it due to hardware limitation.
Sorry. Are we good to close this up then?