Deprecated in favor of xivo-polycom-5.4.3.

This is redundant with with the default config.

The 5.4.3 Polycom documentation says this is disabled by default, but
my tests show this is not the case.

Note that the VVX101 and VVX201 also have it disabled, even if they don't
support the remote XiVO directory.

They don't have a microbrowser (or XML browser, i.e. they can't access
the XiVO remote directory), so don't display a key that do nothing on
them.

So that the MAC address is also extracted when a request for
<mac>-user.cfg is done.

The 5.4 firmware is necessary to support the VVX101 and VVX201 phones.

The plugin is working, but there's still more tests to be done on the
phones, and some things seems a bit broken (the remote directory on the
VVX101 and VVX201, the "remote directory" softkey location, the default
configuration of the second line key on the VVX101).

Only available for some models, see http://projects.xivo.io/issues/6134
for more information.

For those models for which space is quite limited, i.e.:

* T19P E2
* T21P E2
* T23
* T40P

They share all the same language file it seems.

The EXP20 is an expansion module for the T27P and T29G. Like the EXP40,
you can program up to 40 function keys on it (20 functions keys per page
and 2 pages per extension module), but contrary to the EXP40, it does
not have physical keys to switch from one page to the other: you instead
have to manually configure a function key to do the page switching.
Here's an example configuration:

   expansion_module.1.key.1.type = 37
   expansion_module.1.key.1.label = PAGE 1

   expansion_module.1.key.21.type = 37
   expansion_module.1.key.21.label = PAGE 2

See http://projects.xivo.io/issues/6100#note-7 for more details.

Patch contributed by Julien Revert.

Use the same style as the xivo-yealink-v80 plugin, i.e. device not shown
in the description, and not particular markup in the firmware
description.

Do not show non-officially supported devices in description, e.g.:

* T23
* T27
* T29
* T49

There would ideally be another mean to easily differentiate between the
support level of the different models...

These are not "officially supported devices", so don't add them in the
plugin description.

Seems like it's official "code name" is VP-T49G, but we'll call it T49G.

Did no test other than plugging the phone.

When on a call and pressing on a function key, the phone now does an
attended transfer to the destination instead of a blind transfer.

Ticket #6037.

Remove xivo-snom-8.7.5.17 and xivo-snom-8.7.5.28. Both obsoleted by
xivo-snom-8.7.5.35.

Contribution from Vincent Garbay:
  http://projects.xivo.io/boards/8/topics/4254?r=4803#message-4803

The xivo-polycom-4.0.9 plugin obsolete the xivo-polycom-4.0.4 plugin.

The xivo-polycom-5.3.1 plugin obsolete the xivo-polycom-5.3.0 plugin.

Does not completly obsolete the xivo-snom-8.7.5.17 plugin since the
8.7.5.28 firmware is not available for all supported models.