The Cisco ATA 188 Analog Telephone Adaptor is now obsolete (past End-of-Life and End-of-Support status).
End-of-Sale Date: 2006-05-12
End-of-Support Date: 2011-05-31
Cisco's End-of-Life Policy
You can view a listing of available Cisco ATA 180 Series Analog Telephone Adaptors offerings that best meet your specific needs
If you want support information for the Cisco ATA 188 Analog Telephone Adaptor documentation, it may be available through Cisco.com Search or in the Cisco Community