Have you tried security oriented distro Operator.iso by ussysadmin.org? It is based on knoppix and debian. Also it is one of the best network testing and pen testers tool?
Fanvil V64 VOIP Phone + power supply, handset, and aftermarket stand *USED*
$44.99
Fanvil V64 VOIP Business Phone- Black *NEW*
$74.99
Cisco CP-8851 Color Display VOIP IP Business Phone w/ BT and POE
$40.00
Cisco IP Video Desk Phone (CP-8865) - Charcoal (OPEN BOX)
$47.52
Cisco/Linksys SPA2102 VoIP Phone Adapter Router 2FXS (Unlocked)
$15.49
Unlocked Cisco / Linksys SPA2102 VoIP 2FXS Phone Adapter with Router
$17.99
Cisco CP-7811 VOIP IP Business Phone w/Handset & Stand POE
$16.49
Ooma Telo VoIP Free Internet Home Phone Service and HD3 Handset
$50.00
Cisco CP-8821-K9 Wireless IP VoIP Phone WITH BATTERY
$198.99
Grandstream HT801 Single-Port Analog Telephone Adapter
$34.00