e1 pri on cisco 2651 - informational messages on vty

[glmonarch]

Hello, all!

I connect my PBX Aastra MX-ONE TSW to cisco 2651 via E1 PRI.

I connect to cisco 2651 via telnet to vty terminal. I type command terminal monitor to see debug messages. Every 10 seconds I see this in vty terminal:

May 28 18:31:38.534: ISDN Se1/0:15 Q921: User TX -> RRp sapi=0 tei=0 nr=40

May 28 18:31:38.538: ISDN Se1/0:15 Q921: User RX <- RRf sapi=0 tei=0 nr=79

What does it mean?

And how I can turn off only these messages about ISDN? They interfere me. Thx.

[Richard Burts · Accepted solution]

Try the command show debug. The output suggests that a debug is running for ISDN Q921. If the debug is running you can turn that specific debug off or the easy thing would be to use undebug all. This should stop those messages.

HTH

Rick

[glmonarch]

Thanks, Rick! It solved my problem. And I want to know what are these messages?

[Richard Burts]

Q921 is one of the lower level protocols used within ISDN. These messages are being sent back and forth between the devices to verify that some parameters were correctly set.

HTH

Rick