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Cisco ATA 186 and Cisco ATA 188 Analog Telephone Adaptor Administrator’s Guide (H.323)
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Chapter4 Basic and Additional H.323 Services
Important Basic H.323 Services
Setting Up User IDs for the Cisco ATA
Each Cisco ATA can support two FXS ports. You can assign a user ID, which is usually an E.164 phone
number, to each port. Use the CiscoATA parameter UID0 to configure an ID for the Phone 1 port, and
use the UID1 parameter for the user ID of the Phone 2 port.
Related Configuration Parameters
•UID0, page 5-10
•UID1, page 5-11
Using the Cisco ATA with an H.323 Gatekeeper
The Cisco ATA can function with an H.323 gatekeeper to enable Cisco ATA registration, admission, and
use of directory services on an H.323 network. To use the Cisco ATA with a primary H.323 gatekeeper,
you need to configure the GkOrProxy parameter with the IP address assi gned to the primary H.323
gatekeeper. Optionally, you can specify the primary gatekeeper identifier using the GkId parameter if
this identifier is required for the CiscoATA to successfully register with the H.323 network.
This section contains the following topics:
•Choosing Cisco ATA Registration Mode with an H.323 Gatekeeper, page 4-3
•Setting Up Gatekeeper Time-To-Live Value, page 4-4
•Setting Up an Alternate H.323 Gatekeeper, page 4-4
•Establishing Authentication with Cisco H.323 Gatekeeper, page 4-5
Related Configuration Parameters
•GkOrProxy, page 5-15
•GkId, page 5-17

Choosing Cisco ATA Registration Mode with an H.323 Gatekeeper

The Cisco ATA can register with an H.323 gatekeeper in one of two modes:
•Single registration—Both CiscoATA FXS ports register at the same time with the H.323 gatekeeper.
This reduces gatekeeper registration traffic by 50 percent when both ports are enabled.
•Dual registration—Each FXS port registers separately with the H.323 gatekeeper.
To configure single-mode registration, you need to set the UseLoginID par ameter to 1, and then
configure the LoginID1 and LoginID2 parameters with identi cal values. The LoginID1 and LoginID2
parameters are used for the H.323 ID, whereas the UID0 a nd UID1 parameter values are used as E.164
phone numbers.