Avaya

only uses pins 1,2,3 + 6 (100Base-T)
PoE compatible
custom power module available: GND:pin 7, +48V:pin 8
upon booting (about 20 seconds), the following message appears:
100 mbps ethernet (you might want to unplug the ethernet cable if the keys do not respond)

* to program (after this step, you can plug in the ethernet connection again so you are able to type in the SIG command at the end)
press *
confirm every default with # (8x)
at the end, it says "No new values. #=OK": confirm
at the blank screen, type mute744# (Mute SIG#, you will notice a distinct short tick when pressing mute, and other keys being silent)
change to SIP by cycling using * and confirm using #

You will need a TFTP server and the 46xxSettings.txt file (see Avaya's sample and a snippet from LeftyBC on github gist

Power (over Ethernet) compatibility:
barrel plug: none

Note:

Avaya 9608

Avaya 9650

latest supported SIP firmware version seems to be 2.6.17.0
also uses 46xxsettings.txt
- $MACADDR is not usable in the config file
- SKINS and CURRENT_SKIN doesn't work
- CURRENT_CONTENT works: even the option of adding hidden menus
- CURRENT_LOGO doesn't work
- SET SIP_CONTROLLER_LIST is most likely numeric
- no support for FORCE_SIP_*
8+1 auxiliary buttons are not programmable, only the 3 appLines, 4 softKeys and 5 hardButtons (calllog, contacts amenu, message, forward)
doesn't handle 401 Unauthorized
xopr had problems with ACK/BYE from the phone (it never hangs up and some calls will disconnect after ~30 seconds)

Location: xopr's (project crate and a bunch at home)

Contents