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Cisco ATA 186 and Cisco ATA 188 Analog Telephone Adaptor Administrator’s Guide for MGCP (version 3.0)
OL-4803-01
Chapter 1 Cisco Analog Telephone Adaptor Overview
Hardware Overview
• Determines the availability of the target endpoint.
• Establishes a session between the originating and target endpoint if a call can be completed. MGCP
also supports mid-call changes, such as adding another endpoint to the conference or changing a
media characteristic or codec.
• Each MGCP endpoint supports up to two connections per device. Each connection has a fixed
ID—0, 1, 2, or 3. Connection IDs 0 and 2 are assigned to MGCP Endpoint 0, and connection IDs 1
and 3 are assigned to MGCP Endpoint 1.
MGCP is a client-server protocol. The Call Agent handles all aspects of setting up calls to and from
endpoints. Call Agents or control servers provide the feature capabilities that a particular endpoint uses.
Endpoints connected to different Call Agents likely will have a different set of features.
Each control-server vendor determines its own set of features.
Hardware Overview
The Cisco ATA 186 and Cisco ATA 188 are compact, easy-to-install devices. Figure 1-4 shows the rear
panel of the Cisco ATA 186. Figure 1-5 shows the rear panel of the Cisco ATA 188.
Figure 1-4 Cisco ATA 186—Rear View
Figure 1-5 Cisco ATA 188—Rear View
10BaseT ACT 5VPHONE 1 PHONE 2
72210
RJ-11 FXS ports
RJ-45 10BaseT
ACT LED
Power
connector
10/100 UPLINK10/100 PC LINKLINK 5VPHONE 1 PHONE 2
72211
RJ-11 FXS ports
LINK LED
Power
connector
LINK LED
RJ-45 10/100BaseT ports