4-6
Cisco ATA 186 and Cisco ATA 188 Analog Telephone Adaptor Administrator’s Guide (H.323)
OL-4008-01
Chapter4 Basic and Additional H.323 Services
Important Basic H.323 Services
Using the Cisco ATA Without an H.323 Gatekeeper
You can use the CiscoATA without using an H.323 gatekeeper, as this section describes with the
following topics:
•Using the Cisco ATA With an H.323 Gateway but Without an H.323 Gatekeeper, page 4-6
•Using Multiple Cisco ATAs Without an H.323 Gatekeeper, page 4-6

Using the Cisco ATA With an H.323 Gateway but Without an H.323 Gatekeeper

You can use a CiscoATA with an H.323 network that does not conta in an H.323 gatekeeper. In this
scenario, all calls initiated from the CiscoATA are directed to a specified H.323 gateway. To specify this
H.323 gateway, you configure its IP address using the Gateway parameter, and you disable the H.323
gatekeeper feature by setting the GkorProxy parameter to 0.
Note For all calls sent from the H.323 gateway to the Cisco ATA, the E.164 number assigned to each of the
Cisco ATA FXS ports must be included in the H.225 Setup message, either in the DestinationAddress
field or the Q.931 CalledPartyNumber field. The CiscoATA will reject the call if it cannot find its E.164
number in the H.255 Setup message.
Related Configuration Parameters
•Gateway, page 5-12
•GkOrProxy, page 5-15

Using Multiple Cisco ATAs Without an H.323 Gatekeeper

You can make calls from one CiscoATA to another Cisco ATA in an H.323 network that does not contain
an H.323 gatekeeper.
For one Cisco ATA to access a specific FXS port on another Cisco ATA, you use an IP dialing procedure.
The Cisco ATA originating the call must have the following information about the destination
Cisco ATA:
•E.164 phone number of the destination FXS port
•IP address of the destination Cisco ATA
To enable the IP dialing procedure, you need to set the IPDialPlan parameter to 1 to instruct the
Cisco ATA to look for the destination IP address in the dialed digits.
Example
Cisco ATA X is going to initiate a call to CiscoATA Y (with the following pertinent information):
•IP address of Cisco ATA Y—192.168.2.112.
•E.164 phone number for the Phone 1 port of CiscoATA Y—1:5556666
•E.164 phone number for the Phone 2 port of CiscoATA Y—2:5558888
To call the Phone 1 port on CiscoATA Y, you would dial 5556666**192*168*2*112#.
To call the Phone 2 port on CiscoATA Y, you would dial 5558888**192*168*2*112#.