Remove the "sip_servers" block. This also fix a bug, i.e. in previous
version, if you had a backup registrar/proxy configured on your XiVO,
and then removed it, the phone would still hold the reference to the
backup registrar/proxy.

Set "account.X.nat.udp_update_enable" to 0, so that by default the phone
stops sending an empty UDP packet to the registrar every 30 seconds.

Set "account.X.fallback.redundancy_type" to 1, i.e. to "successive
registration", which is how XiVO HA works.

Set "features.caller_name_type_on_dialing" to 1, so that the phone
doesn't display the SIP username on the phone when dialing (which is
just random gibberish).

Set "sip.notify_reboot_enable" to 0, so to not force the phone to always
reboot when changing a setting.

Work in progress.

The 1.3.5p firmware is necessary for the new Silicon Labs chip.
Otherwise, the firmware is the same as 1.3.5.

Now that all xivo-snom plugins support the same domain-less syntax for
function keys.

To VVX400/VVX410.

And move the other common.cfg from common into 4.0.4.

If you don't install the bootblock, then you'll brick your VVX1500, as
documented in http://supportdocs.polycom.com/PolycomService/support/global/documents/support/technical/products/voice/upgrading_vv1500_5_2_0_tb695.pdf

This drops support for VVX1500, which requires a special procedure to
upgrade to 5.3.0 and is not officially supported.

FIX yealink 2015-03: zip files instead of rar files

xivo-yealink-2015-03: Update firmware to latest version x.73.0.50

Replaced by the newer xivo-snom-8.7.5.17 plugin.

This drops support for the Snom 360, which is not supported by the
latest firmware.

Some of these models are not officially supported by XiVO, but still
place them in this plugin.

So that the display behaviour of the D7 expansion module is the same as
previously.