Endpoint Manager and Yealink EXP39 modules

The Endpoint Manager Beta doesn’t appear to correctly work with Yealink EXP39 expansion modules.

We have a few T28P phones with one or more EXP39 modules. We can program these easily enough via the Yealink Web interface, or using the OSS Endpoint Manager module and the config files. However using the EXP39 support in the Endpoint Manager Beta the settings are never picked up by the EXP39.

We’ve tried all the button types (DTMP, Speeddial etc) and various values, but the EXP39 never shows anything other than blank after picking up the config file.

Anyone managed to get this working?