General Knoppix support for those who've read the FAQ at the Wiki
Polycom VVX 450 Ring Central Business VoIP Phone Black
$59.91
Cisco CP-8821-K9 Wireless IP VoIP Phone WITH BATTERY
$99.99
Grandstream GS-HT802 2 Port Analog Telephone Adapter VoIP Phone & Device, Black
$32.00
Yealink SIP-T41P PoE Ultra Elegant VoIP Phone
$29.95
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
Cisco/Linksys SPA2102 VoIP Phone Adapter Router 2FXS (Unlocked)
$16.99
Ooma Telo Air 2 Free Home Phone Service VoIP 110-0148-300 (Already Registered)
$24.00
Yealink T54W IP Phone, 16 VoIP Accounts. 4.3-Inch Color Display - Black
$99.99
Avaya J179 Business Office IP Phone Desktop VoIP Network AVA-700514469 (Read)
$79.99