To be able to use the SL850H PRO behind:

• N510
• N720

and the full feature-set has to be supported like any other PRO handset, you will need to install this patch.

• N510 Patch, click to download: N510_patch_SL850H.patch
• N720 Patch click to download: N720_patch_SL850H.patch

In the web-interface go to:

• Settings - Management - Save and Restore - Browse
• Select the patch you have downloaded
• The device will reboot