cancel
Showing results for 
Search instead for 
Did you mean: 
cancel
Announcements

AMA-CUCM Troubleshooting: Best Practices for Reading Trace Files

568
Views
0
Helpful
1
Replies
Highlighted

BAD FRAME issue-E1 PRI

We have a bad frame issue on an pri E1 the debug isdn q921 result is as follows: 

 

*Dec 16 14:29:36.203: ISDN Se0/3/0:15 Q921: L2_EstablishDataLink: sending SABME
*Dec 16 14:29:36.203: ISDN Se0/3/0:15 Q921: User TX -> SABMEp sapi=0 tei=0
*Dec 16 14:29:36.227: ISDN Se0/3/0:15 Q921: User RX <- BAD FRAME(0x00017F)
*Dec 16 14:29:37.203: ISDN Se0/3/0:15 Q921: User TX -> SABMEp sapi=0 tei=0
ROUTER(config-voiceport)#
*Dec 16 14:29:37.227: ISDN Se0/3/0:15 Q921: User RX <- BAD FRAME(0x00017F)
*Dec 16 14:29:38.203: ISDN Se0/3/0:15 Q921: User TX -> SABMEp sapi=0 tei=0
ROUTER(config-voiceport)#

*Dec 16 14:29:38.227: ISDN Se0/3/0:15 Q921: User RX <- BAD FRAME(0x00017F)
*Dec 16 14:29:39.203: ISDN Se0/3/0:15 Q921: User TX -> SABMEp sapi=0 tei=0
ROUTER(config-voiceport)#
*Dec 16 14:29:39.227: ISDN Se0/3/0:15 Q921: User RX <- BAD FRAME(0x00017F)

 

ISDN status:

OLD-VPN-ROUTER-UNUSED#show isdn status
Global ISDN Switchtype = primary-net5
ISDN Serial0/3/0:15 interface
dsl 0, interface ISDN Switchtype = primary-net5
Layer 1 Status:
ACTIVE
Layer 2 Status:
TEI = 0, Ces = 1, SAPI = 0, State = AWAITING_ESTABLISHMENT
Layer 3 Status:
0 Active Layer 3 Call(s)
Active dsl 0 CCBs = 0
The Free Channel Mask: 0xFFFF7FFF
Number of L2 Discards = 0, L2 Session ID = 195
Total Allocated ISDN CCBs = 0

 

 

It was working this happened all of a sudden.

Everyone's tags (1)
1 REPLY 1
Beginner

Re: BAD FRAME issue-E1 PRI

There is a config mismatch between your Voice Gateway (i.e. router) and the PSTN carrier.

Check that the Line Coding, Framing, Clocking and isdn switch type is configured correctly on your router and then ask the PSTN provider to align the config on their side too.

 

Please rate if this helps.

CreatePlease to create content
Content for Community-Ad
August's Community Spotlight Awards