The list of phone models is not sorting properly when trying to add a phone.
Was looking to add a Grandstream GXP-2130 and thought it wasn't there, but it was in the wrong place.
As you can see below GXP-2130 is placed betweeen GXP-1782 and GXP-1160.
Please note that Grandstream phones are divided into supported and legacy devices. The fully supported devices are on the top of the Grandstream list and the legacy is on the bottom.
If you wish this to change you can post your idea on https://www.3cx.com/community/forums/3cx-ideas/ . All posts are reviewed by their corresponding Departments and, if feasible and voted for by other users as well, may be implemented in an upcoming service pack or update.