Debugging BRI

Please consult section 3.6 of our Administrative GUI on Configuring BRI: http://www.farsouthnet.com/wp-content/uploads/2011/06/Com.X-administrator-guide-1.4-ver-4.0.1.pdf

1. Confirm that the Com.X is on the latest firmware, including the commaimg package.

2. Access the CLI, place a test call and confirm if your dial plan is routing the call across the BRI port, if not isolate a call trace of failed call. (https://sites.google.com/site/comxwiki/isolating-a-call-from-asterisk-full-log)

3. From the CLI type:

• misdn show stacks

And confirm if L1 Link is up on all ports

4. Exit the CLI and Retrieve the IP address of internal/external ITA of Com.X by typing the following from command line:

• comma-ls

5. Once IP address is confirmed, access the Comma Console interface to output status of BRI ports, by typing the following from command line:

• comma-console -i <ip_address> "bri d1-* status"

If their is a healthy connection between Com.X BRI ports and External device then the slips should be 0, but 1 or 2 slips are still acceptable

If there are slips, this may indicate a timing problem.

6. Ensure that Timing Mode is properly configured on the system. If BRI is the primary trunk, confirm that Hardware entry's Timing Mode in the Com.X GUI is configure to BRI Priority 1 or BRI Priority 2.

7. If the port state is not F7-ACT, or there is a DEACT in the state reported here and by the PBX then:

• Restart internal ITA by typing: comma-ls -r
• Restart Dahdi driver by typing: sudo /etc/init.d/dahdi restart

8. If L1 Link does not come up, then ensure that the correct port type (PTP {point to point} or PMP {point to multi point}) is configured.

9. In /var/log/comma.log, look for any BRI port errors

10. Set misdn debugging on by typing:

• sudo asterisk -rx "misdn set debug on 6"

And look for problems in the BRI communication. Wait for an anomalous event to occur and check /var/log/asterisk/misdn.log , and confirm any errors in the logs

11. If the environment is very noisy, consider using shielded cable (CAT6) and a shielded type RJ-45 connector. Ensure that Com.X is earthed well (< 0.5 ohm measured from the Com.X stud to the earthing point, preferably to telco or failing that building earth) via its earth stud.

12. Ensure correct wiring. Pins 3+6 and 4+5 form the twisted pairs on the RJ-45 for BRI. I.e. a normal CAT5 Ethernet cable is ideal. If the cable is wired with 3+4 and 5+6 paired, signal integrity could be affected.

13. To ensure that BRI ports of Com.X is not faulty, then perform a loop back test on BRI ports and confirm if L1 Links stay up. ( https://sites.google.com/site/comxwiki/bri-loop-back-test)

14. Confirm if External Device (Telco) connected to Com.X is able to place calls, by connecting an analogue phone to the telco BRI device and see whether you can place a call.