Cortelco's fully featured, VoIP Analog Terminal Adaptor, provides a total endpoint solution for interfacing traditional touch tone analog telephones and fax machines to VoIP applications.
Cortelco analog terminal adapter
SIP standardization deployed throughout
Two Voice Ports (RJ-11) support traditional analog touch tone telephones (corded or cordless) or fax machines
One Network Port (RJ-45) for connecting to broadband digital subscriber line (DSL), cable modem or wireless networks
One PC Port (RJ-45) for connecting to a Personal Computer
One Line-In Port (RJ-11) for connecting to the PSTN (if available)
Call switching between VoIP and PSTN calls
Supports Caller ID/Name display or block, Hold, Call Waiting/Flash, Call Transfer, Call Forward, in-band/out-of-band/SIP INFO DTMF, Dial Plans, etc
OFFICE PHONES 
VoIP PRODUCTS 
When 2 or 3 handsets is enough...