10-09-2014 01:26 PM - edited 03-17-2019 12:29 AM
Hey folks!
We're continuing to have a problem which we think is on the provider's side (isn't it always?). However, they keep pushing back on us and telling us they don't see anything wrong with their equipment. They'll admit they see the B and D channels dropping and resyncing (I think that's the terminology they use but I'm not a Voice guy) but all of their interfaces are clean. The problem lasts for 5-10 minutes and happens sporadically. It may happen 3 times 1 day, and not happen again for a week. It's starting to happen more frequently though. Anyway, here are the facts:
I've attached the output of various show and debug commands and hope they'll be helpful. Please let me know if there is additional information you'd like.
Thanks very much!
mitch
10-09-2014 02:38 PM
can you post show run | i clock
10-10-2014 05:16 AM
Sure!
network-clock-participate wic 0
network-clock-select 1 T1 0/0/0
10-09-2014 07:04 PM
looks like your later 2 was down
do you have deb isdn q921 ?
HQ-VGW1# show isdn status Global ISDN Switchtype = primary-ni 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 = TEI_ASSIGNED Layer 3 Status: 1 Active Layer 3 Call(s) Active dsl 0 CCBs = 0 The Free Channel Mask: 0x807FFFFF Number of L2 Discards = 0, L2 Session ID = 123 Total Allocated ISDN CCBs = 0
10-10-2014 05:17 AM
I was not debugging q921 at that time. I'll make sure to do that if we have the issue again.
Thanks!
10-09-2014 09:05 PM
Create a T1 loopback plug and then plug it into the T1 port. Run debug isdn q921 output & check if the SABME was sent
this message received should be:
RX <- BAD FRAME(0x00017F)Line may be looped!
The BAD FRAME messages indicate that the router performs correctly. The router sends out the SABME packet. The message is looped back to the router, because of which, the router receives the same SABME message that was sent. The router marks it as a BAD FRAME, and presents the error message. The error message states that the line is probably looped. This is the expected behavior for the looped circuit. Therefore, the problem lies within the Telco ISDN switch or the cabling from the demarc to the Telco switch.
Refer to the link below:
http://www.cisco.com/c/en/us/support/docs/wan/t1-e1-t3-e3/8131-T1-pri.html
10-10-2014 05:19 AM
That sounds really interesting - I'll look into that.
Thanks!
10-22-2014 05:18 AM
This still isn't resolved, but at least the telco recognizes it's a problem on their end now that another customer is having the exam same issue as we are.
Thanks for the help everyone.
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