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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
Additional H.323 Services
Network Timing
You can fine-tune your network timing with the following parameters:
•TimeZone, page 5-29—Use for time-stamping incoming calls (offset from Greenwich Mean Time)
with local time.
•NTPIP, page 5-30—Use for configuring the IP address of the Network Time Protocol server. NTP
is a protocol built on top of TCP that ensures accurate local time-keeping with reference to radio
and atomic clocks located on the Internet.
•AltNTPIP, page 5-30—Use to configure an alternate NTP server IP address.
•ConnectMode, page 5-28—Used to control the connection mod e of the H.323 protocol.
Polarity Settings
You can control line polarity of the Cisco ATA FXS ports when a call is connected or disconnected by
configuring the Polarity bitmap parameter (see the “Polarity” section on page5-27).
Progress Tones
Values for the following parameters (all defined in the “Call-Progress Tone Parameters” section on
page 5-41) must be determined based on the country in which the Cisco ATA is located:
•DialTone
•BusyTone
•ReorderTone
•RingBackTone
•CallWaitTone
•AltertTone
Selecting DTMF and Hookflash Transmission Methods
The Cisco ATA is designed to use H.245 messages to relay DTMF and hookflash events. Both the H.245
alphanumeric IE method and the H.245 signal IE method are supp orted for transporting DTMF events.
The H.245 signal IE method has higher precedence if the far end also supports this method.
Use bits 4-5 (Phone 1 port) and 20-21 (Phone 2 port) of the AudioMode parameter to configure the
DTMF transmission method.
Use bit 6-7 (Phone 1 port) and 22-23 (Phone 2 port) of the AudioMode parameter to configure the
hookflash transmission method.
Related Configuration Parameter
AudioMode, page 5-20