57
Slot Type 7 6 5 4 3 2 1 0
2 T1 B B B B G G G G
CLOCK CHANGE HISTORY
CLOCK Event Time
Freerun Change in CLI configuration 23:27:25 UTC Tue Nov 30 1999
Gateway#
•Verify your BITS clock selection by using the show tdm clocks command:
Gateway# show tdm clocks
Primary Clock:
System primary is external with priority 1
TDM Bus Master Clock Generator State = NORMAL
Backup clocks for primary:
Source Slot Port DS3-Port Priority Status State
Trunk 2 0 NO 204 Good Default
Trunk 2 1 NO 205 Good Default
Trunk cards controllers clock health information
Slot Type 7 6 5 4 3 2 1 0
2 T1 B B B B G G G G
CLOCK CHANGE HISTORY
CLOCK Event Time
External Change in CLI configuration 23:27:25 UTC Tue Nov 30 1999
Gateway#
Tip The most common reason for clock slip problems is that the dial-tdm-clock priority parameter is set improperly. Change
the default setting for dial-tdm-clock priority from free-running clock to a setting that matches your system
requirements.

Saving Configuration Changes

To prevent the loss of the gateway configuration, save it to NVRAM, by following these steps:
Step1 Enter the enable command and password to go to privileged EXEC mode. You are in privileged EXEC mode when the
prompt changes to Gateway#.
Gateway> enable
Password: password
Gateway#
Step2 Save the configuration changes to NVRAM so that they are not lost during resets, power cycles, or power outages:
Gateway# copy running-config startup-config
Step3 Return to privileged EXEC mode:
Gateway(config-if)# Ctrl-Z
Gateway#
Voice over IP

Prerequisites

Before you can configure your universal gateway to use Voice over IP, you must first do the following: