3Com VCX V7122 SIP VoIP Gateway User Manual68should use is a configurable parameter that can be specified either in the ini file(NTPServerUTCOffset) or via an SNMP MIB object.If required, the clock update is performed by the client as the final step of the updateprocess. The update is done in such a way as to be transparent to the end users. Forinstance, the response of the server may indicate that the clock is running too fast on theclient. The client slowly robs bits from the clock counter in order to update the clock to thecorrect time. If the clock is running too slow, then in an effort to catch the clock up, bits areadded to the counter, causing the clock to update quicker and catch up to the correct time.The advantage of this method is that it does not introduce any disparity in the system time,that is noticeable to an end user, or that could corrupt call timeouts and timestamps.Configuring the Channel SettingsThe Channels Settings screen enables you to set the VoIP gateway channel parameters,such as Input and Output voice gain, Jitter buffer characteristics, Modem, Fax and DTMFtransport modes. These parameters are applied to all VCX V7122 channels.Note that several Channels Settings parameters can be configured per call using profiles(see Configuring the Profile Definitions on page 58).To configure the Channel Settings parameters, follow these steps:1 Open the ‘Channel Settings’ screen (Advanced Configuration menu > ChannelSettings); the ‘Channel Settings’ screen is displayed.2 Configure the Channel Settings parameters.3 Click the Submit button to save your changes.4 To save the changes so they are available after a power fail, see Save Configuration onpage 88.Channel parameters are changeable on-the-fly. Changes take effect from next call.
