Was only used by the xivo-aastra-2.6 plugin, which has been removed
earlier this year.

DHCP integration is required for the phone model to be automatically
extracted, so if you have not / can't enable DHCP integration, your
phone will not upgrade their firmware automatically.

updated yealink plugin with the latest .30 firmware for T2X series and added sip backup proxy/registrar in tpl

removed 5.0.1 plugins because it is oriented to lync phones, 4.1.6 is the better firmware, asked by polycom support

added the latest yealink w52p firmware 25.40.0.15 and the handset OTA firmware 26.40.0.15, the OTA only working under certain circonstances. Please read the yealink manual

It has a slightly different behaviour than the other T4X.

* key were not removed from phone when removed from config
* BLF was only working for the first 10 keys
* could not use expansion module key