How to Enable PRI/BRI Debug

1. PRI includes 3 layers before we can make a call through PRI, we need to make sure the first two layers work normally. Layer 1 indicates physical connection while layer 2 indicates the synchronization between Yeastar and the PRI provider.

Note: this guide also applies to the BRI line. 


2. Debug commands under Asterisk CLI.

1) Check the physical layer:

dahdi show status
Description Alarms IRQ bpviol CRC4 Fra Codi Options LBO
                 RED     0 0 0 CCS AMI YEL 0 db
                 OK      0 0 0 CCS AMI YEL 0 db
OK means layer 1 connected successfully. RED means disconnected.

under asterisk CLI, you can check layer 2 with command:

2) Check the data link layer:

pri show spans
PRI span 1/0: Provisioned, Up, Active
PRI span 2/0: Provisioned, Down, Active

Up means layer 2 synchronize correctly, Down means synchronize failed.

3)  Check the application layer:

pri set debug 2 span XTurn on PRI debug for span X
pri set debug off span XTurn off PRI debug for span X

X is the span number you got at step 2).

Have more questions? Submit a request


  • 0

    Hi, good tips.  They apply to P-Series, correct?  Thanks, Gustavo.

  • 1

    Yes, the CLI commands is the same.

Please sign in to leave a comment.