Cortelco, IP Phone, models:

121000TP227S	User Manual
2757	User Manual Brochure
C56	User Manual Quick Installation Manual
C56P	User Manual
C58	User Manual Quick Installation Manual
C58P	Admin Manual
C60	User Manual Quick Installation Manual
C62 VoIP Phone	Quick Installation Manual User Manual
SIP-T18P	Quick Reference
VOIP 2747	User Manual