The Grandstream HTXXX FXS requires a special character in their passwords now (Update 1.0.31.1), however 3CX wont let you set it. Therefor, when uploading the configuration to the FXS the default password "admin" remains. Please allow special characters for Grandstream HTXXX FXS devices.
Seems like 3CX is somewhat aware of the issue, but still an issue. This could be potentially a SECURITY RISK if user does not check if admin password was actually changed by 3CX generated configuration file.
Staff, please re-review this situation or remind someone that it is still a present issue and a security threat.