Dialogic IMG - Issue where IMG does not synchronize time correctly

Table of Contents

Symptom

Dialogic IMG 1010 Integrated Media Gateway (IMG 1010) does not synchronize to the SNTP server, but the SNTP server is already synchronized to an NTP time server. 

The SNTP server is on Red Hat Enterprise Linux (RHEL) 4; the issue does not occur on RHEL 3.

Reason for the issue

The behavior of NOTRUST changed between NTP versions 4.1 (used by RHEL 3) and 4.2 (used by RHEL 4): 

• In 4.1 (and earlier) NOTRUST means "Don't trust this host/subnet for time". 

• In 4.2 (and later) NOTRUST means "Ignore all NTP packets that are not cryptographically authenticated".  

The behavior in version 4.2 (and later) forces remote time servers to authenticate themselves to a client ntpd.

For more information please refer to the NTP Public Services Project Website http://support.ntp.org/bin/view/Support/TroubleshootingNTP#Section_9.7 . 

To check the NTP version, run the program ntpdc in the /usr/sbin directory: 

Alternatively, you can run rpm to check the NTP version: 

Fix / Solution:

Edit the ntp.conf to configure the SNTP server:

1. Open a terminal session on the Linux system and Login as root 

2. Edit the ntp.conf file: 

3. Remove notrust from the line containing the IP address of the IMG 1010. 

4. Save the file.  

Alternatively, run the ntp configuration script with optional parameter rh4: (located at opt/cantata/common/osconfig). 
 

Restart the SNTP server:  

Verify the Linux system is synchronized with an NTP server: 

Verify the correct time on the IMG 1010 using the front panel, or via a telnet terminal session on the IMG 1010, typing the b command: 

Product List

Dialogic IMG 1010 Integrated Media Gateway

Glossary of Acronyms / Terms

NTP: Network Time Protocol
SNTP: Simple Network Time Protocol