[cisco-voip] ISDN PRI problem

[Mark Holloway]

I have experienced this before. It could be a physical problem.  Try replacing the cable from your E1 port to the Telco equipment.  If replacing the cable does not work try re-seating your VWIC. 

On Nov 23, 2009, at 8:05 AM, Abebe Amare wrote:

> Dear,
> Cisco ISR 3845 (image c3845-spservicesk9-mz.124-21)connected to telco with ISDN PRI is experiencing ISDN problems. When the problem happens I notice TIMER_RECOVERY on the layer 2 status and I will do a clear interface serial 2/0:15 and clear controller E1 2/0 which will change the layer 2 status to MULTIPLE_FRAME_ESTABLISHED. But outgoing calls can not go through unless I do a reload of the router.I get the following error when I do a debug isdn q931
> 
> Nov 23 07:02:34.385: ISDN Se2/0:15 Q931: TX -> RELEASE_COMP pd = 8  callref = 0x254F 
>         Cause i = 0x80E6 - Recovery on timer expiry
> Nov 23 07:02:34.385: ISDN Se2/0:15 **ERROR**: CCPCC_CallOrigination: SETUP timed-out (2nd T303) to NETWORK.  The SETUP failed.
> Nov 23 07:02:35.385: ISDN Se2/0:15 Q931: TX -> RELEASE_COMP pd = 8  callref = 0x254F 
>         Cause i = 0x80E6 - Recovery on timer expiry
> 
> The configuration on the serial interface is as follows
> 
> controller E1 2/0
>  pri-group timeslots 1-31
>  description Temp-Outgoing
> !
> !
> interface Serial2/0:15
>  no ip address
>  encapsulation hdlc
>  isdn switch-type primary-net5
>  isdn incoming-voice voice
>  isdn map address 012* plan isdn type national
>  isdn map address 015* plan isdn type national
>  isdn sending-complete
>  no cdp enable
> 
> I have attached output if debug isdn q921 messages before and after the reload of the router.
> 
> regards,
> 
> Abebe Amare
> Network Engineer, VivaCell
> CCNP, CCNA (Voice)
> 
> 
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