Limitation - Altigen ACM 6.5 Administration Manual

If you assign a feature profile (for example: 2 - Sales Group) to an extension
Important:
in Extension Configuration, and that feature profile is subsequently deleted
and a new feature profile is created that uses the same number (for example:
2 - Marketing Group), the extension will automatically be assigned to the new
feature profile. So, it is important to note which extensions are assigned to
certain feature profiles, especially when adding new profiles or deleting old
ones.

Limitation

You should include #26 (Station Logout) in a feature profile assigned to an IP phone. If
#26 is disabled in that phone's feature profile, phone registration issues arise.
MAXCS ACM 6.5 Administration Manual 73
Feature Profiles