Cisco ATA188-I2-A Administration Guide - Page 73

Chapter 4 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 5-36-Use for time-stamping incoming calls (offset from Greenwich Mean Time) with local time. • NTPIP, page 5-10-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 5-11-Use to configure an alternate NTP server IP address. • ConnectMode, page 5-32-Used to control the connection mode 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 page 5-39). Progress Tones Values for the following parameters (all defined in the "Tone Configuration 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 supported 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 5-24 OL-4804-01 Cisco ATA 186 and Cisco ATA 188 Analog Telephone Adaptor Administrator's Guide for H.323 (version 3.0) 4-11