Steps to reproduce:

1.Navigate to Web Server > Enabled? in the config ui of Aastra phones.
2. Disable the option "Enabled?". Apply. ok.
3. Send the profiles.

Expected:
The phone should reboot and upon trying to access the web ui, the web ui should come up.

Actual:
The phones TUI itself does not appear.
A message, "Network" is displayed on the phone top and there is no response from the phone anymore.
The phones web ui does not come up either.

Observation.
Upon enabling and disabling the web interface, the configuration file<mac>.cfg gets updated accordingly.
That is, "web interface enabled:" gets updated to 1 and 0 for enabling and disabling respectively.
The phone would come up only if the web interface is enabled again and the profiles are sent. In this case it is required to manually reboot the phone.

Information about this feature as per Aastra admin guide.
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Aastra Web UI Settings

Parameter -web interface enabled : Configuration Files aastra.cfg, <mac>.cfg
Description
Enables or disables the Aastra Web UI for a single IP phone when placed
in the <mac>.cfg file.
Enables or disables the Aastra Web UI for all phones when placed in the
aastra.cfg file.

Parameter : web interface enabled
Format : Boolean
Default Value : Not Applicable
Range : 0 = Disable 1 = Enable
Example web interface enabled: 1