DND icon does not persist through a reboot

[Anonymous]

VVX500 and VVX310 Phones

UC Software Version 5.8.0.12848 Updater Version

5.9.5.13643

Running Asterisk 13/Freepbx 13 system.

Background of issue:

As a workaround for server side DND, I have the following settings on the phones to disable the built in DND softkey that simply bypasses calls to VoiceMail, and sends feature code command *76, then set the DND icon on the phone's LCD screen to show that DND is enabled: 

<feature feature.enhancedFeatureKeys.enabled="1"  softkey.feature.mystatus="0" homeScreen.application.enable="0" efk.softkey.alignleft="1"/>
<dnd feature.enhancedFeatureKeys.enabled="1" softkey.feature.doNotDisturb="0" />
<softkey softkey.3.action="$FDoNotDisturb$^*76$Tinvite$" softkey.3.enable="1" softkey.3.label="DND">
    <softkey.3.use softkey.3.use.idle="1" />
</softkey>

However, we're finding that the phone's DND icon can easily be cleared/reset, so that the phone's icon and what's set on the server become out of sync and is confusing. I've noticed that this occurs when the phone reboots, for instance. It also seems (according to end users) that the icon has reset to normal over night regardless of a reboot.

Is there a way to have the DND icon persist through a reboot? 
I'm thinking similar to persist volume
eg:

<Volume voice.volume.persist.handset="1"/>

But for DND?

[SteffenBaierUK]

Hello @WZKDS ,

welcome to the Polycom Community.

You would need Server Based DND for this to work as the phone would not store the DND state over a reboot.

Jun 07, 2012 Question: How can I add a server based DND / Do not disturb and / or Call Forward?
Resolution: Please check => here <=

The above FAQ was created as people asked for similar features but I assume nobody in the open source Digium community showed any interest.

Please ensure to provide some feedback if this reply has helped you so other users can profit from your experience.

Best Regards

Steffen Baier