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1-1
Cisco ATA 186 and Cisco ATA 188 Analog Telephone Adaptor Administrator’s Guide (SIP)
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Cisco Analog Telephone Adaptor Overview
This section describes the hardware and software features of the Cisco Analog Telephone Adaptor
(Cisco ATA) and includes a brief overview of the Session Initiation Protocol (SIP).
The Cisco ATA analog telephone adaptors are handset-to-Ethernet adaptors that allow regular analog
telephones to operate on IP-based telephony networks. Cisco ATAs support two voice ports, each with
an independent telephone number. The Cisco ATA 188 also has an RJ-45 10/100
BASE-T data port.
This section covers the following topics:
• Session Initiation Protocol (SIP) Overview, page 1-2
• Hardware Overview, page 1-5
• Software Features, page 1-7
• Installation and Configuration Overview, page 1-10
Figure 1-1 Cisco ATA Analog Telephone Adaptor
The Cisco ATA, which operates with Cisco voice-packet gateways, makes use of broadband pipes that
are deployed through a digital subscriber line (DSL), fixed wireless-cable modem, and other Ethernet
connections.
Note The term Cisco ATA refers to both the Cisco ATA 186 and the Cisco ATA 188, unless otherwise stated.
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ANALOG TELEPHONE ADAPTO
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CISCO ATA 186