PRI Layer 3

[akhilesh.pandey1]

Hi,

PRI controller's (0/0/0) Layer 1 and 2 shows up but there no call coming to layer 3.  Can you please suggest from where I should start the troubleshooting. Other 2x ISDN PRI working fine on same 2921 router. CUCM configuration look good.

"

ISDN Serial0/0/0:23 interface
        dsl 0, interface ISDN Switchtype = primary-ni
    Layer 1 Status:
        ACTIVE
    Layer 2 Status:
        TEI = 0, Ces = 1, SAPI = 0, State = MULTIPLE_FRAME_ESTABLISHED
    Layer 3 Status:
        0 Active Layer 3 Call(s)
    Active dsl 0 CCBs = 0
    The Free Channel Mask:  0x807FFFFF
    Number of L2 Discards = 0, L2 Session ID = 20

"

Thanks for your response.

Regards,

[Richard Burts]

I wonder if the debug for Q931 might provide helpful information.

HTH

Rick

[Richard Bradfield]

You perhaps need to check whether you have the right Telephone number for this PRI, as Richard suggested a Debug of Q931 will show you if the call is being received on the PRI interface.

[akhilesh.pandey1]

Thanks Richards.

1) what do you mean by  right Telephone number for this PRI (how ot get this info).

2) There is no output on the screen after applying debug command. i tried to shut and no shut the interface. 

Regards,

Akhilesh

[Richard Burts]

Akhilesh

Thanks for posting the output of show controller T1. I do not see anything in the output that would help to identify the problem.

I do not want to put words into Richard's mouth but I believe that what he was suggesting when he mentions right Telephone number is the possibility that what has been configured for accessing this PRI (especially from the remote side) may not match up with what your provider has provisioned for this circuit. If they are attempting to reach a certain phone number and what the provider has provisioned is a different number then it would explain why there is no incoming traffic.

Can you clarify a bit about the debug output? It may be that there is no debug output because there was no Q931 activity. But it also might be that there was no output because logging was not configured in a way that would display the output (perhaps logging level set higher than level 7 = debug, or perhaps terminal monitor not enabled, or some kind of issue like that). If you enable other debugs do you get debug output?

HTH

Rick

[Richard Bradfield]

Akhilesh

can you share the configuration of the 2921 router, to give us more information

[akhilesh.pandey1]

Thanks Rishard. 

Please find the attached debug output for your reference. There are other T1 ports connected, which is working fine expect 0/0/0:23.

Thanks for your response.

Regards,

Akhilesh

[Richard Burts]

Akhilesh

Thank you for posting the debug output. I believe that there are several lines which do indicate the problem

Jan  6 15:56:37: ISDN Se0/0/0:23 Q931: pak_private_number: Invalid type/plan 0x0 0x0 may be overriden; sw-type 13

Jan  6 15:56:37: ISDN Se0/0/0:23 Q931: TX -> DISCONNECT pd = 8  callref = 0x05ED
        Cause i = 0x80AF - Resource unavailable, unspecified

The first line is more difficult to interpret but indicates type/plan is invalid and probably indicates some mismatch between what you have set up and what the provider provisioned on the circuit. I suggest that you check with the provider and have them clarify how they set up this circuit. It may be that if you send them a copy of the debug output that they could interpret the error better than we can.

The second line is more clear and indicates that some resource is unavailable. My guess is that this relates to the first message and reflects a mismatch between what you have set up and what the provider did.

HTH

Rick

[akhilesh.pandey1]

Thanks Rick. 

I will check with ISP, however these errors appears with other interface but they are participating on the call and layer 3 active. 

Regards,

Akhilesh

[akhilesh.pandey1]

Hi Rick, Richard,

This problem has been resolve after hard reboot for the gateways. I am still working on the RCA.

Thanks for your support.

Regards,

Akhilesh

[Richard Burts]

Akhilesh

I am glad to know that the problem is solved. Thanks for posting back to the forum to let us know of this. This may serve as a reminder that sometimes when the config seems right but things are not working that a reboot may sometimes resolve the problem.

HTH

Rick

[johnlloyd_13]

hi,

could you post show controllers t1 output?

make sure the framing, line code, and clock source settings are correct.

[akhilesh.pandey1]

Here is the show Controllers T1 output.  

T1 0/0/0 is up.
Applique type is Channelized T1
Cablelength is long 0db
No alarms detected.
alarm-trigger is not set
Soaking time: 3, Clearance time: 10
AIS State:Clear LOS State:Clear LOF State:Clear
Version info FPGA Rev: 08121917, FPGA Type: PRK4
Framing is ESF, Line Code is B8ZS, Clock Source is Line.
CRC Threshold is 320. Reported from firmware is 320.
Data in current interval (446 seconds elapsed):
0 Line Code Violations, 0 Path Code Violations
0 Slip Secs, 0 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins
0 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 0 Unavail Secs
Total Data (last 24 hours)
0 Line Code Violations, 0 Path Code Violations,
0 Slip Secs, 0 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins,
0 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 10 Unavail Secs