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?
Grandstream GS-HT802 2 Port Analog Telephone Adapter VoIP Phone & Device, Black
$32.00
NEW Polycom VVX 501 VoIP IP Phone & Stand Tested VVX501 2200-48500-019 Lync
$43.98
Polycom OBi202 Port VoIP Phone Adapter with Google Voice
$97.95
Grandstream HT801 Single-Port Analog Telephone Adapter
$34.00
Cisco CP-7945G VOIP Phone With Stand & Handset Business IP Phone 7945
$3.00
Ooma Telo Free Home Phone Service VoIP Phone - Black
$19.99
New Cisco 7945G IP VoIP Gigabit GIGE Telephone Phone CP-7945G -
$24.95
Yealink SIP-T54W W/ HD Display Business VoIP Phone w/ Built-in Bluetooth and POE
$69.99
REF A-STOCK - Polycom 2200-48450-025 VVX 411 IP VOIP POE Gigabit Telephone
$39.56
Lot Of 5 Phones: Yealink SIP-T29G 10-Lines Color IP Phone
$63.99