General Knoppix support for those who've read the FAQ at the Wiki
Grandstream GS-HT802 2 Port Analog Telephone Adapter VoIP Phone & Device, Black
$32.00
Polycom VVX 411 IP VOIP POE Gigabit Telephone [L/N] BUSINESS OFFICE RECEPTION
$24.00
Genuine Desktop 8 Line Gigabit VoIP Phone System Mitel IP480G PN 630-3481-01
$89.99
Lot Of 8 Cisco CP-7945G VOIP Business IP Phone w/ Stand and Handset #0358
$162.98
Cisco CP-7945G VOIP Phone With Stand & Handset Business IP Phone 7945
$3.00
Lightly Used Cisco 8811 Series VoIP phone Factory Reset great condition
$19.95
OOMA Office VOIP Business Phone System Base Unit + 2 Linx Devices, Internet
$30.00
Grandstream GS-GXP2160 Multiline Bluetooth VoIP Telephone - Black
$25.99
Polycom VVX 411 IP VOIP POE Gigabit Telephone ONSIP GOOGLE VOICE ZOOM MEETING
$24.00
Grandstream GS-GXP2170 VoIP Phone & Device 4.3" Color-Screen LCD Gigabit Ports
$45.00