Polycom

Power (over Ethernet) compatibility:
barrel plug: 5.5/2.5 48V

Note:

VVX 301

Default passcode: 456
This device can handle 401: unauthorized
has a boot time of about 140 seconds!
webinterface available at https://<ip>
has 6P6C (RJ12) AUX port
has 5 pin (0.1" 3x2 with notch) female header
has unpopulated internal 2 pin header (J300) seen through the upper slot
both AUX and header pins 5 are connected (GND?): RJ12 second right, header, first left at the top

power up the phone
Wait for Starting application. press Cancel to interrupt and press Cancel (right softbutton)
at the countdown screen, press and hold 1+5+3 for >3 seconds
enter the MAC address located near the connectors (without colons) as password (old style sms-mode; note that for entering digits or characters, you need to set the correct input type. Also it's not case sensitive. Button 2 will show you the current mode and next mode)

To get its IP: Press 🏠, go down 2 times (Settings ⚙️), Ok (joypad center), 4,2,1 (Status, Network, TCP/IP Parameters)

Under Settings » SIP » Local Settings, the following settings are needed (note that a Simple Setup will get you started as well):

Local SIP Port: <make sure this port does not conflict with other SIP devices behind the same NAT>, 0 seems to work as well
Digit Map: 1[01579]xS0|1[23]xxS0|5000S0|2xxS0|00x.|0[1234567]xxxxxxxxS0|088xxxxxxxS0|0800xxxx.|090[069]xxxx.
Server 1 » Address: ackspace.nl
Transport: DNSnaptr¹
Expires (s): 110

Under Lines » Line 1, set the following:

¹⁾ or use: TCPpreferred and set Outbound Proxy » Address to sip.ackspace.nl (not tested)

One can use a custom ringtone (using Alert-Info) with the following steps:

go to Preferences » Ringtones and upload a wav file
- format the file with sox SOURCEFILE.wav -r 16000 -c 1 -b 16 ringtone.wav (or use Audacity/Tenacy, 16khz, 16bit mono wave)
upload the file
- note that upon reboot the actual file will be lost (remove and re-add the file to restore)
use the following dialplan: originate {sip_h_Alert-Info=http://illegaleshow.stream/ringtone.wav}user/bergeijk@ackspace.nl YOUR_POLYCOM_EXT xml ackspace
- note that the domain must exist (and not redirect; 404 is fine); the filename must match the uploaded file