Known Issue

AnyPhone BYOP/Generic SIP Polycom phones (Soundpoint IP and VVX) adopted to Intermedia Unite may not function as expected with BLF keys. They can only be programmed locally via the phone's Web UI. In testing, it was found that programming the BLF keys is rather simple, however, when attempting to answer a call, the phone would attempt to pick up the call, but then it would immediately discontinue the action.

It was discovered that the Call Pickup function was not being activated during this process. Direct Call Pickup *95 + extension can be dialed manually and it will indeed work. Read the Knowledge Base article on How Do I Use Directed Call Pickup for more information.  However, if you have Polycom phones that are no longer supported by Intermedia you will need to have this function programmed into the phone manually.

Since Polycom phones do not have a field within the Web UI to accomplish this, it must be done via the configuration files.

Resolution

AnyPhone BYOP/Generic SIP Polycom phones (Soundpoint IP and VVX) will not have the following information for call pickup.
-call pickup can be used manually but for BLF keys, this must be added to the config file
Export_all.cfg

Navigate to: WebUI > Utilities > Import & Export Configuration > Export Configuration > Select from the drop-down menu All Configuration (except Device Settings) > Click on Export.  The file name after saving will appear as Export_all.cfg
Edit/add the lines as follows:

call.directedCallPickupMethod="legacy"
call.directedCallPickupString="*95"

Edit the above file using any xml editor or Notepad++. Notepad++ is the preferred option.

After you have completed editing, upload the file Export_all.cfg, to WebUI > Utilities > Import & Export Configuration > Import Configuration > select Export_all.cfg > Click on the Import button.

The phone will reboot. After it has completed this, either add BLF keys or test any existing ones to ensure that Directed Call Pickup is now functioning.

 Read the Knowledge Base article on How To Configure Busy Lamp Function On A Phone for more information. 

Note: when testing, it does not seem that the above lines have a specific location for placement within the configuration file, it only matters that they are present for directed call pickup to function with BLF keys.